70
OWNER’S MANUAL
q Read this manual carefully before operating this
outboard motor.
U.S.A.Edition
LIT-18626-07-93
6H3-28199-1W
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Important manual information
EMU31283
there is any question concerning this manu-
al, please consult your Yamaha dealer.
To the owner
Thank you for choosing a Yamaha outboard
motor. This Owner’s Manual contains infor-
mation needed for proper operation, mainte-
nance and care. A thorough understanding
of these simple instructions will help you ob-
tain maximum enjoyment from your new
Yamaha. If you have any question about the
operation or maintenance of your outboard
motor, please consult a Yamaha dealer.
In this Owner’s Manual particularly important
information is distinguished in the following
ways.
TIP:
The 70TR and the standard accessories are
used as a base for the explanations and illus-
trations in this manual. Therefore some
items may not apply to every model.
EMU25111
70
OWNER’S MANUAL
©2008 byYamaha Motor Corporation, USA
1st edition, April 2008
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, USA
is expressly prohibited.
: This is the safety alert symbol. It is
used to alert you to potential personal injury
hazards. Obey all safety messages that fol-
low this symbol to avoid possible injury or
Printed in Japan
P/N LIT-18626-07-93
death.
EWM00781
WARNING
A WARNING indicates a hazardous situa-
tion which, if not avoided, could result in
death or serious injury.
ECM00701
NOTICE
A NOTICE indicates special precautions
that must be taken to avoid damage to the
outboard motor or other property.
TIP:
A TIP provides key information to make pro-
cedures easier or clearer.
Yamaha continually seeks advancements in
product design and quality. Therefore, while
this manual contains the most current prod-
uct information available at the time of print-
ing, there may be minor discrepancies
between your machine and this manual. If
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Table of contents
Specifications of Battery..................14
Mounting battery .............................14
Multiple batteries.............................15
Propeller selection ........................ 15
Start-in-gear protection ................. 15
Engine oil requirements................ 15
Fuel requirements......................... 15
Gasoline..........................................15
Ring Free Fuel Additive...................16
Muddy or acidic water................... 16
Anti-fouling paint........................... 16
Motor disposal requirements......... 17
Emergency equipment.................. 17
Emission control information......... 17
North American models...................17
Components.................................... 19
Components diagram.................... 19
Fuel tank .........................................19
Fuel joint..........................................20
Fuel gauge ......................................20
Fuel tank cap...................................20
Air vent screw..................................20
Remote control box.........................20
Remote control lever.......................20
Neutral interlock trigger...................21
Neutral throttle lever........................21
Tiller handle.....................................21
Gear shift lever................................21
Throttle grip.....................................22
Throttle indicator .............................22
Throttle friction adjuster...................22
Engine shut-off cord (lanyard) and
clip.................................................23
Engine stop button ..........................23
Main switch .....................................24
Steering friction adjuster .................24
Power trim and tilt switch on
Safety information.............................1
Outboard motor safety .................... 1
Propeller............................................ 1
Rotating parts.................................... 1
Hot parts ........................................... 1
Electric shock.................................... 1
Power trim and tilt ............................. 1
Engine shut-off cord (lanyard)........... 1
Gasoline............................................ 1
Gasoline exposure and spills............ 2
Carbon monoxide.............................. 2
Modifications..................................... 2
Boating safety ................................. 2
Alcohol and drugs ............................. 2
Personal flotation devices................. 2
People in the water ........................... 2
Passengers....................................... 2
Overloading....................................... 2
Avoid collisions ................................. 3
Weather ............................................ 3
Accident reporting............................. 3
Boat education and training .............. 3
Passenger training............................ 4
Boating safety publications ............... 4
Laws and regulations........................ 4
Boating organizations...................... 4
Basic boating rules (Rules of the
road) ..............................................4
Steering and sailing rules and
sound signals.................................. 5
Rules when encountering vessels .... 5
Other special situations..................... 6
General information ..........................9
Identification numbers record.......... 9
Outboard motor serial number.......... 9
Key number....................................... 9
Read manuals and labels.............. 10
Warning labels ................................ 10
Specifications and requirements...13
remote control or tiller handle .......24
Power trim and tilt switch on
bottom engine cowling ..................25
Trim tab with anode.........................25
Trim rod (tilt pin)..............................26
Tilt support lever for power trim and
tilt model........................................26
Top cowling lock lever(s) (turn
Specifications................................ 13
Installation requirements............... 14
Boat horsepower rating................... 14
Mounting motor............................... 14
Remote control requirements........ 14
Battery requirements..................... 14
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Table of contents
type).............................................. 26
Instruments and indicators ............28
Feeding fuel (portable tank) ............42
Starting engine................................43
Checks after starting engine......... 46
Cooling water ..................................46
Warming up engine....................... 46
Electric start and prime start
models ..........................................46
Checks after engine warm-up....... 46
Shifting ............................................46
Stop switches..................................46
Shifting.......................................... 47
Stopping boat................................ 48
Stopping engine............................ 48
Procedure........................................48
Trimming outboard motor.............. 49
Adjusting trim angle (Power trim
Digital tachometer ......................... 28
Tachometer..................................... 28
Trim meter....................................... 28
Hour meter...................................... 28
Oil level indicator (digital type) ........ 29
Overheat-alert indicator .................. 29
Analog tachometer........................ 29
Oil level indicators (three
indicators) ..................................... 29
Analog trim meter.......................... 30
Engine control system....................31
Alert system .................................. 31
Overheat alert ................................. 31
Oil level alert and oil filter clogging
and tilt) ..........................................50
Adjusting boat trim ..........................51
Tilting up and down....................... 51
Procedure for tilting up (power trim
alert............................................... 31
Installation .......................................33
Installation..................................... 33
Mounting the outboard motor.......... 33
Operation .........................................35
and tilt models)..............................52
Procedure for tilting down (power
First-time operation ....................... 35
Breaking in engine .......................... 35
Getting to know your boat............... 35
Checks before starting engine ...... 35
Fuel level......................................... 36
Remove cowling.............................. 36
Fuel system..................................... 36
Controls........................................... 37
Engine shut-off cord (lanyard)......... 37
Oil.................................................... 37
Engine............................................. 37
Operation after a long period of
trim and tilt models).......................53
Shallow water................................ 54
Power trim and tilt models...............54
Cruising in other conditions........... 55
Maintenance .................................... 56
Transporting and storing outboard
motor ........................................... 56
Storing outboard motor ...................56
Procedure........................................56
Lubrication (oil injection models).....57
Cleaning and anticorrosion
measures ......................................58
Cleaning the outboard motor...........58
Checking painted surface of
storage.......................................... 37
Install cowling.................................. 38
Checking power trim and tilt
motor.............................................58
system .......................................... 39
Battery............................................. 39
Filling fuel and engine oil............... 40
Filling fuel for portable tank............. 40
Filling oil for electric start
models .......................................... 40
Oil level indicator operation............. 42
Operating engine........................... 42
Periodic maintenance ................... 58
Replacement parts..........................59
Severe operating conditions............59
Maintenance chart 1........................60
Maintenance chart 2........................62
Greasing..........................................63
Cleaning and adjusting spark
plug ...............................................63
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Table of contents
Checking fuel filter .......................... 64
Inspecting idling speed ................... 64
Checking water in engine oil
tank............................................... 65
Checking wiring and connectors..... 65
Checking propeller.......................... 65
Removing propeller......................... 66
Installing propeller........................... 66
Changing gear oil............................ 67
Cleaning fuel tank ........................... 68
Inspecting and replacing
anode(s)........................................ 69
Checking battery (for electric start
models)......................................... 69
Connecting the battery.................... 70
Disconnecting the battery ............... 70
Trouble Recovery............................71
Troubleshooting ............................ 71
Temporary action in emergency.... 74
Impact damage ............................... 74
Replacing fuse ................................ 74
Power trim and tilt will not
operate.......................................... 75
Starter will not operate.................... 75
Emergency starting engine ............. 76
Engine fails to operate .................. 77
Ignition system malfunction............. 77
Cold engine fails to start ................. 77
Treatment of submerged motor..... 79
Consumer information....................80
Important warranty information for
U.S.A. and Canada .....................80
YAMAHA MOTOR
CORPORATION, U.S.A.
OUTBOARD MOTOR TWO
YEAR LIMITED WARRANTY ......82
IMPORTANT WARRANTY
INFORMATION IF YOU USE
YOUR YAMAHA OUTSIDE THE
USA OR CANADA ......................85
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Safety information
EMU33622
tor and the clamp bracket when the motor is
trimmed or tilted. Keep body parts out of this
area at all times. Be sure no one is in this
area before operating the power trim and tilt
mechanism.
Outboard motor safety
Observe these precautions at all times.
EMU36500
Propeller
People can be injured or killed if they come
in contact with the propeller. The propeller
can keep moving even when the motor is in
neutral, and sharp edges of the propeller can
cut even when stationary.
● Shut off the engine when a person is in the
water near you.
● Keep people out of reach of the propeller,
The power trim and tilt switches operate
even when the main switch is off. Keep peo-
ple be away from the switches whenever
working around the motor.
Never get under the lower unit while it is tilt-
ed, even when the tilt support lever is locked.
Severe injury could occur if the outboard mo-
tor accidentally falls.
EMU33671
even when the engine is off.
EMU33630
Engine shut-off cord (lanyard)
Rotating parts
Attach the engine shut-off cord so that the
engine stops if the operator falls overboard
or leaves the helm. This prevents the boat
from running away under power and leaving
people stranded, or running over people or
objects.
Always attach the engine shut-off cord to a
secure place on your clothing or your arm or
leg while operating. Do not remove it to leave
the helm while the boat is moving. Do not at-
tach the cord to clothing that could tear
loose, or route the cord where it could be-
come entangled, preventing it from function-
ing.
Hands, feet, hair, jewelry, clothing, PFD
straps, etc. can become entangled with inter-
nal rotating parts of the engine, resulting in
serious injury or death.
Keep the top cowling in place whenever pos-
sible. Do not remove or replace the cowling
with the engine running.
Only operate the engine with the cowling re-
moved according to the specific instructions
in the manual. Keep hands, feet, hair, jewel-
ry, clothing, PFD straps, etc. away from any
exposed moving parts.
EMU33640
Hot parts
Do not route the cord where it is likely to be
accidentally pulled out. If the cord is pulled
during operation, the engine will shut off and
you will lose most steering control. The boat
could slow rapidly, throwing people and ob-
During and after operation, engine parts are
hot enough to cause burns. Avoid touching
any parts under the top cowling until the en-
gine has cooled.
EMU33650
jects forward.
Electric shock
Do not touch any electrical parts while start-
ing or operating the engine. They can cause
EMU33810
Gasoline
Gasoline and its vapors are highly flam-
mable and explosive. Always, refuel ac-
cording to the procedure on page 42 to
reduce the risk of fire and explosion.
shock or electrocution.
EMU33660
Power trim and tilt
Body parts can be crushed between the mo-
1
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Safety information
EMU33820
recommends that you must wear a PFD
whenever boating. At a minimum, children
and non-swimmers should always wear
PFDs, and everyone should wear PFDs
when there are potentially hazardous boat-
Gasoline exposure and spills
Take care not to spill gasoline. If gasoline
spills, wipe it up immediately with dry rags.
Dispose of rags properly.
If any gasoline spills onto your skin, immedi-
ately wash with soap and water. Change
clothing if gasoline spills on it.
ing conditions.
EMU33730
People in the water
If you swallow gasoline, inhale a lot of gaso- Always watch carefully for people in the wa-
line vapor, or get gasoline in your eyes, get ter, such as swimmers, skiers, or divers,
immediate medical attention. Never siphon whenever the engine is running. When
fuel by mouth.
someone is in the water near the boat, shift
into neutral and shut off the motor.
Stay away from swimming areas. Swimmers
can be hard to see.
The propeller can keep moving even when
the motor is in neutral. Shut off the engine
EMU33900
Carbon monoxide
This product emits exhaust gases which
contain carbon monoxide, a colorless, odor-
less gas which may cause brain damage or
death when inhaled. Symptoms include nau-
sea, dizziness, and drowsiness. Keep cock-
pit and cabin areas well ventilated. Avoid
when a person is in the water near you.
EMU33750
Passengers
blocking exhaust outlets.
Consult your boat manufacturer’s instruc-
tions for details about appropriate passenger
locations in your boat and be sure all pas-
sengers are positioned properly before ac-
celerating and when operating above an idle
speed. Standing or sitting in non-designated
locations may result in being thrown either
overboard or within the boat due to waves,
wakes, or sudden changes in speed or direc-
tion. Even when people are positioned prop-
erly, alert your passengers if you must make
any unusual maneuver. Always avoid jump-
EMU33780
Modifications
Do not attempt to modify this outboard mo-
tor. Modifications to your outboard motor
may reduce safety and reliability, and render
the outboard unsafe or illegal to use.
EMU33740
Boating safety
This section includes a few of the many im-
portant safety precautions that you should
follow when boating.
EMU33710
ing waves or wakes.
EMU33760
Alcohol and drugs
Never operate after drinking alcohol or tak-
ing drugs. Intoxication is one of the most
common factors contributing to boating fatal-
ities.
EMU33720
Overloading
Do not overload the boat. Consult the boat
capacity plate or boat manufacturer for max-
imum weight and number of passengers. Be
sure that weight is properly distributed ac-
cording to the boat manufacturers instruc-
tions. Overloading or incorrect weight
distribution can compromise the boats han-
Personal flotation devices
Have an approved personal flotation device
(PFD) on board for every occupant. Yamaha
2
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Safety information
dling and lead to an accident, capsizing or boating in hazardous weather.
EMU33800
swamping.
EMU33771
Accident reporting
Boat operators are required by law to file a
Avoid collisions
Scan constantly for people, objects, and Boating Accident Report with their state
other boats. Be alert for conditions that limit boating law enforcement agency if their boat
your visibility or block your vision of others.
is involved in any of the following accidents:
1. There is loss of life or probable loss of
life.
2. There is personal injury that requires
medical attention beyond first aid.
3. There is property damage to boats or
other property over a certain amount.
4. There is complete loss of a boat.
Contact local law enforcement personnel if a
report is necessary.
EMU33870
ZMU06025
Boat education and training
Operate defensively at safe speeds and
keep a safe distance away from people, ob-
jects, and other boats.
● Do not follow directly behind other boats or
waterskiers.
● Avoid sharp turns or other maneuvers that
make it hard for others to avoid you or un-
derstand where you are going.
● Avoid areas with submerged objects or
shallow water.
● Ride within your limits and avoid aggres-
sive maneuvers to reduce the risk of loss
of control, ejection, and collision.
● Take early action to avoid collisions. Re-
member, boats do not have brakes, and
stopping the engine or reducing throttle
can reduce the ability to steer. If you are
not sure that you can stop in time before
hitting an obstacle, apply throttle and turn
Operators should take a boating safety
course. This may be required in your state.
Many of the organizations listed in the next
section can provide information about cours-
es in your area.
You may also want to consider an Internet-
based program for basic boater education.
The Online Boating Safety Course provided
by the BoatU.S. Foundation, is approved by
the National Association of State Boating
Law Administrators (NASBLA) and recog-
nized by the United States Coast Guard.
Most, but not all, states accept this course to
meet their minimum requirements. While it
cannot replace an in-depth course such as
one offered by the U.S. Coast Guard, U.S.
Power Squadron, or other organization, this
online course does provide a general over-
view of the basics in boating safety, require-
ments, navigation, and operation. Upon
successful completion of the course, the
user can download a certificate of comple-
tion immediately or, for a small charge, re-
quest one by mail. To take this free course,
in another direction.
EMU33790
Weather
Stay informed about the weather. Check
weather forecasts before boating. Avoid
3
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Safety information
go to boatus.org.
United States Power Squadrons
1-888-FOR-USPS (1-888-367-8777)
EMU33880
Passenger training
Make sure at least one other passenger is
trained to operate the boat in the event of an
emergency.
EMU33890
Boat Owners Association of The United
States
1-800-336-BOAT (1-800-336-2628)
Boating safety publications
Be informed about boating safety. Additional
publications and information can be obtained
from many boating organizations.
EMU33590
National Association of State Boating
Law Administrators (NASBLA)
1500 Leestown Road, Suite 330
Lexington, KY 4051 859-225-9497
859-225-9497
Laws and regulations
Know the marine laws and regulations where
you will be boating- and obey them. Several
sets of rules prevail according to geographic
location, but all are basically the same as the
International Rules of the Road. The rules
presented in the following section are con-
densed- and have been provided for your
convenience only.
Contact the U.S. Coast Guard, the National
Association of State Boating Law Adminis-
trators, or your local Power Squadron for a
complete set of rules governing the waters in
National Marine Manufacturers Associa-
tion (NMMA)
200 East Randolph Drive
Suite 5100
Chicago, IL 606001
Marine Retailers Association of America
155 N. Michigan Ave. Chicago,
IL 60601
which you will be using your boat.
EMU33680
Boating organizations
The following organizations provide boating
safety training and information about boating
safety and laws.
EMU33690
Basic boating rules (Rules of
the road)
Just as there are rules that apply when you
are driving on streets and highways, there
United States Coast Guard
Consumer Affairs Staff (G-BC)
Office of Boating, Public, and Consumer Af- are waterway rules that apply when you are
fairs
driving your boat. These rules are used inter-
nationally. (For USA: and are also enforced
by the United States Coast Guard and local
agencies.) You should be aware of these
rules, and follow them whenever you en-
counter another vessel on the water.
U.S. Coast Guard Headquarters
Washington, D.C. 20593-0001
Boating Safety Hotline: 1-800-368-5647
4
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Safety information
EMU33700
vessels try to avoid each other. If that is the
case, both vessels become “ Give-Way ”
vessels.
EMU25521
Steering and sailing rules and sound
signals
Whenever two vessels on the water meet
one another, one vessel has the right-of-
way; it is called the “stand-on” vessel. The
vessel that does not have the right-of-way is
called the “give-way” or “burdened”vessel.
These rules determine which vessel has the
right-of-way, and what each vessel should
do.
Rules when encountering vessels
There are three main situations that you may
encounter with other vessels which could
lead to a collision unless the Steering Rules
are followed:
Meeting: (you are approaching another ves-
sel head-on)
Crossing: (you are traveling across the oth-
er vessel’s path)
Stand-on vessel
The vessel with the right-of-way has the duty Overtaking: (you are passing or being
to continue its course and speed, except to passed by another vessel)
avoid an immediate collision. When you In the following illustration, your boat is in the
maintain your direction and speed, the other center. You should give the right-of-way to
vessel will be able to determine how best to any vessels shown in white area (you are the
avoid you.
Give-Way vessel). Any vessels in the shad-
ed area must yield to you (they are the Give-
Way vessels). Both you and the meeting
vessel must alter course to avoid each other.
Give-way vessel
The vessel that does not have the right-of-
way has the duty to take positive and timely
action to stay out of the way of the Stand-On
vessel. Normally, you should not cross in
front of the vessel with the right-of-way. You
should slow down or change directions brief-
ly and pass behind the other vessel. You
should always move in such a way that the
operator of the other vessel can see what
you are doing.
“ The general prudential rule ”
This rule is called Rule 2 in the International
Rules and says,
Meeting
If you are meeting another power vessel
head on, and are close enough to run the risk
of collision, neither of you has the right-of-
way Both of you should alter course to avoid
an accident. You should keep the other ves-
sel on your port (left) side. This rule doesn’t
apply if both of you will clear one another if
you continue on your set course and speed.
“ In obeying and construing these rules due
regard shall be had to all dangers of naviga-
tion and collision, and to any special circum-
stances, which may render a departure from
the above rules necessary in order to avoid
immediate danger.”
In other words, follow the standard rules ex-
cept when a collision will occur unless both
5
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Safety information
EMU25531
Other special situations
There are three other rules you should be
aware of when driving your boat around oth-
er vessels.
Narrow channels and bends
When navigating in narrow channels, you
should keep to the right when it is safe and
practical to do so. If the operator of a power-
driven vessel is preparing to go around a
bend that may obstruct the view of other wa-
ter vessels, the operator should sound a pro-
longed blast on the whistle (4 to 6 seconds).
If another vessel is around the bend, it too
should sound the whistle. Even if no reply is
heard, however, the vessel should still pro-
ceed around the bend with caution. If you
navigate such waters with your boat, you will
need to carry a portable air horn, available
from local marine supply stores.
Crossing
When two power driven vessels are crossing
each other’s path close enough to run the
risk of collision, the vessel which has the oth-
er on the starboard (right) side must keep out
of the way of the other. If the other vessel is
on your right, you must keep out of its way;
you are the Give-Way vessel. If the other
vessel is on your port (left) side, remember
that you should maintain course and direc-
tion, provided the other vessel gives you the
right-of-way as it should.
Fishing vessel right-of-way
All vessels that are fishing with nets, lines or
trawls are considered to be “fishing vessels”
under the International Rules. Vessels with
trolling lines are not considered fishing ves-
sels. Fishing vessels have the right-of-way
regardless of position. Fishing vessels can-
not, however, impede the passage of other
vessels in narrow channels.
Sailing vessel right-of-way
Sailing vessels should normally be given the
right-of-way. The exceptions to this are:
1. When the sailing vessel is overtaking
the power-driven vessel, the power-driv-
en vessel has the right-of-way.
2. Sailing vessels should keep clear of any
fishing vessel.
3. In a narrow channel, a sailing vessel
should not hamper the safe passage of
a power-driven vessel that can navigate
only in such a channel.
Overtaking
If you are passing another vessel, you are
the “Give-Way” vessel. This means that the
other vessel is expected to maintain its
course and speed. You must stay out of its
way until you are clear of it. Likewise, if an-
other vessel is passing you, you should
maintain your speed and direction so that the
other vessel can steer itself around you.
6
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Safety information
Reading buoys and other markers
The waters of the United States are marked
for safe navigation by the lateral system of
buoyage. Simply put, buoys and markers
have an arrangement of shapes, colors,
numbers and lights to show which side of the
buoy a boater should pass on when navigat-
ing in a particular direction. The markings on
these buoys are oriented from the perspec-
tive of being entered from seaward (the boat-
er is going towards the port). This means that
red buoys are passed on the starboard
(right) side when proceeding from open wa-
ter into port, and black buoys are to port (left)
side. When navigating out of port, your posi-
tion with respect to the buoys should be re-
versed; red buoys should be to port and
black buoys to starboard.
Many bodies of water used by boaters are
entirely within the boundaries of a particular
state. The Uniform State Waterway Marking
System has been devised for these waters.
This system uses buoys and signs with dis-
tinctive shapes and colors to show regulato-
ry or advisory information. These markers
are white with black letters and orange
boarders. They signify speed zones, restrict-
ed areas, danger areas, and general infor-
mation.
Remember, markings may vary by geo-
graphic location. Always consult local boat-
ing authorities before driving your boat in
unfamiliar waters.
7
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Safety information
ZMU01708
8
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General information
EMU25171
Identification numbers record
EMU25183
Outboard motor serial number
The outboard motor serial number is
stamped on the label attached to the port
side of the clamp bracket.
Record your outboard motor serial number in
the spaces provided to assist you in ordering
spare parts from your Yamaha dealer or for
reference in case your outboard motor is sto-
len.
1. Key number
1
ZMU02931
1. Outboard motor serial number location
EMU25190
Key number
If a main key switch is equipped with the mo-
tor, the key identification number is stamped
on your key as shown in the illustration.
Record this number in the space provided for
reference in case you need a new key.
9
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General information
EMU33520
Read manuals and labels
Before operating or working on this motor:
● Read this manual.
● Read any manuals supplied with the boat.
● Read all labels on the outboard motor and the boat.
If you need any additional information, contact your Yamaha dealer.
EMU33831
Warning labels
If these labels are damaged or missing, contact your Yamaha dealer for replacements.
1
3
2
ZMU06181
10
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General information
1
2
3
ZMU05670
11
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General information
EMU33843
Electrical hazard
Symbols
The following symbols mean as follows.
Notice/Warning
ZMU05666
Remote control lever/gear shift lever operat-
ing direction, dual direction
ZMU05696
Read Owner’s Manual
ZMU05667
Engine start/ Engine cranking
ZMU05664
Hazard caused by continuous rotation
ZMU05668
ZMU05665
12
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Specifications and requirements
EMU31480
Spark plug gap:
Specifications
0.9–1.0 mm (0.035–0.039 in)
Control system:
TIP:
Remote control
Starting system:
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
Electric
Starting carburetion system:
Prime start
Likewise, “(SUS)” represents the value for
stainless steel propeller installed and “(PL)”
Min. cold cranking amps (CCA/SAE):
380.0 A
for plastic propeller installed.
EMU2821C
Min. marine cranking amps (MCA/ABYC):
502.0 A
Min. reserve capacity (RC/SAE):
124 minutes
Maximum generator output:
6.0 A
Dimension:
Overall length:
713 mm (28.1 in)
Overall width:
364 mm (14.3 in)
Overall height L:
1374 mm (54.1 in)
Transom height L:
521 mm (20.5 in)
Weight (without propeller) L:
104.0 kg (229 lb)
Performance:
Drive unit:
Gear positions:
Forward-neutral-reverse
Gear ratio:
2.33 (28/12)
Trim and tilt system:
Power trim and tilt
Propeller mark:
K
Full throttle operating range:
5000–6000 r/min
Maximum output:
51.5 kW@5500 r/min
(70 HP@5500 r/min)
Idling speed (in neutral):
800 50 r/min
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Min. pump octane:
86
Fuel tank capacity:
25 L (6.60 US gal, 5.50 Imp.gal)
Recommended engine oil:
YAMALUBE 2-stroke outboard motor
oil
Engine:
Type:
2-stroke L
Displacement:
849.0 cm
Bore × stroke:
72.0 × 69.5 mm (2.83 × 2.74 in)
Ignition system:
CDI (micro computer)
Spark plug (NGK):
B8HS-10
3
Lubrication:
Oil injection
Engine oil tank capacity:
2.8 L (2.96 US qt, 2.46 Imp.qt)
Recommended gear oil:
Hypoid gear oil SAE#90
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Specifications and requirements
Gear oil quantity:
move suddenly and unexpectedly, pos-
0.610 L (0.645 US qt, 0.537 Imp.qt)
Tightening torque for engine:
Spark plug:
sibly causing a collision or throwing
passengers overboard.
● If the engine ever starts in gear, the
start-in-gear protection device is not
working correctly and you should dis-
continue using the outboard. Contact
your Yamaha dealer.
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
Propeller nut:
35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
EMU33553
Installation requirements
The remote control unit must be equipped
with a start-in-gear protection device(s). This
device prevents the engine from starting un-
EMU33563
Boat horsepower rating
EWM01560
less it is in neutral.
EMU25694
WARNING
Overpowering a boat can cause severe
instability.
Battery requirements
EMU25713
Before installing the outboard motor(s), con-
firm that the total horsepower of your mo-
tor(s) does not exceed the boats maximum
horsepower rating. See the boat’s capacity
Specifications of Battery
Use a fully charged battery that meets the
following specifications. The engine cannot
be started if battery voltage is too low.
plate or contact the manufacturer.
EMU33571
Minimum cold cranking amps (CCA/
Mounting motor
SAE):
380.0 A
EWM01570
WARNING
Minimum marine cranking amps (MCA/
● Improper mounting of the outboard mo-
tor could result in hazardous condi-
tions such as poor handling, loss of
control, or fire hazards.
ABYC):
502.0 A
Minimum reserve capacity (RC/SAE):
124 minutes
● Because the motor is very heavy, spe-
cial equipment and training is required
to mount it safely.
ECM01061
NOTICE
Do not use a battery that does not meet
the specified capacity. If a battery that
does not meet specifications is used, the
electric system could perform poorly or
be overloaded, causing electric system
damage.
Your dealer or other person experienced in
proper rigging should mount the motor using
correct equipment and complete rigging in-
structions. For further information, see page
33.
EMU33581
EMU36290
Remote control requirements
Mounting battery
EWM01580
Mount the battery holder securely in a dry,
well-ventilated, vibration-free location in the
WARNING
● If the engine starts in gear, the boat can
14
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Specifications and requirements
boat. WARNING! Do not put flammable For instructions on propeller removal and in-
items, or loose heavy or metal objects in stallation, see page 65.
the same compartment as the battery.
Fire, explosion or sparks could result.
[EWM01820]
EMU36300
x
-
Multiple batteries
1
2 3
To connect multiple batteries, such as for
multiple engine configurations or for an ac-
cessory battery, consult your Yamaha dealer
about battery selection and correct wiring.
EMU34191
ZMU04606
Propeller selection
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
Next to selecting an outboard, choosing the
right propeller is one of the most important
purchasing decisions a boater can make.
The type, size, and design of your propeller
have a direct impact on acceleration, top
speed, fuel economy, and even engine life.
Yamaha designs and manufactures propel-
lers for every Yamaha outboard motor and
every application.
EMU25770
Start-in-gear protection
Yamaha outboard motors or Yamaha-ap-
proved remote control units are equipped
with start-in-gear protection device(s). This
feature permits the engine to be started only
when it is in neutral. Always select neutral
Your outboard motor came with a Yamaha
propeller chosen to perform well over a
range of applications, but there may be uses
where a different propeller would be more
appropriate.
before starting the engine.
EMU25651
Engine oil requirements
Recommended engine oil:
YAMALUBE 2-stroke outboard motor
oil
Your Yamaha dealer can help you select the
right propeller for your boating needs. Select
a propeller that will allow the engine to reach
the middle or upper half of the operating
range at full throttle with the maximum boat-
load. Generally, chose a larger pitch propel-
ler for a smaller operating load and a smaller
pitch propeller for a heavier load. If you carry
loads that vary widely, chose the propeller
that lets the engine run in the proper range
for your maximum load but remember that
you may need to reduce your throttle setting
to stay within the recommended engine
speed range when carrying lighter loads.
If the recommended engine oil is not avail-
able, another 2-stroke engine oil with an
NMMA-certified TC-W3 rating may be used.
EMU36360
Fuel requirements
EMU36780
Gasoline
Use a good quality gasoline that meets the
minimum octane rating. If knocking or ping-
ing occurs, use a different brand of gasoline
or premium unleaded fuel. Yamaha re-
15
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Specifications and requirements
comends that you use alcohol-free (see al fuel system maintenance.
EMU27270
Gasohol) gasoline whenever possible.
Ring Free Fuel Additive
Recommended gasoline:
Gasoline is a precise blend of many different
substances, each chosen to give certain
characteristics. Gasoline blends have been
changing in recent years in response to con-
cerns about pollution and resulting emis-
sions regulations. One of the most obvious
changes has been the elimination of lead
from most fuels.
As gasoline has changed, the amount of ad-
ditives such as aromatics and oxygenates
has increased. These additives are impor-
tant for the engines in passenger cars, but
they can have detrimental effects in marine
engines, because of increased deposits in
the combustion chamber. When enough de-
posits collect, piston rings begin sticking.
Performance drops and engine wear in-
creases dramatically.
While many additives available may reduce
deposits, Yamaha recommends the use of
Ring Free Fuel Additive, available from
your Yamaha dealer. Ring Free Fuel Addi-
tive has repeatedly proven its ability to clean
combustion deposits from inside the engine,
notably the critical piston-ring-land area, and
fuel system components. Follow product la-
Regular unleaded gasoline with a min-
imum Octane rating of 86 (Pump Oc-
tane Number) = (R+M)/2
ECM01980
NOTICE
● Do not use leaded gasoline. Leaded
gasoline can seriously damage the en-
gine.
● Avoid getting water and contaminants
in the fuel tank. Contaminated fuel can
cause poor performance or engine
damage. Use only fresh gasoline that
has been stored in clean containers.
Gasohol
There are two types of gasohol: gasohol con-
taining ethanol (E10) and that containing
methanol. Ethanol can be used if the ethanol
content does not exceed 10% and the fuel
meets the minimum octane ratings. E85 is a
fuel containing 85% ethanol and must not be
used in your outboard motor. All ethanol
blends containing more than 10% ethanol
can cause fuel system damage or cause en-
gine starting and running problems. Yamaha
does not recommend gasohol containing
methanol because it can cause fuel system
damage or engine performance problems.
It is recommended that you install a water-
separating marine fuel filter assembly (10
micron minimum) between your boat’s fuel
tank and outboard motor when using etha-
nol. Ethanol is known to allow moisture to be
absorbed into boat fuel tanks and systems.
Moisture in the fuel can cause corrosion of
metallic fuel system components, starting
and running complaints and require addition-
beling for use instructions.
EMU36880
Muddy or acidic water
Yamaha strongly recommends that you have
your dealer install the optional chromium-
plated water pump kit if you use the outboard
motor in muddy or acidic water conditions.
However, depending on the model it might
not be required.
EMU36330
Anti-fouling paint
A clean hull improves boat performance. The
boat bottom should be kept as clean of ma-
16
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Specifications and requirements
rine growth as possible. If necessary, the rine SI engines. See the label affixed to your
boat bottom can be coated with an anti-foul- engine for details.
EMU30390
ing paint approved for your area to inhibit
Approval label of emission control certif-
marine growth.
icate
Do not use anti-fouling paint which includes
This label is attached to the bottom cowling.
copper or graphite. These paints can cause
Existing Technology; N/A
more rapid engine corrosion.
1
ZMU06193
1. Approval label location
EMU36340
Motor disposal requirements
Never illegally discard (dump) the motor
Yamaha recommends consulting the dealer
about discarding the motor.
EMU36351
EMISSION CONTROL INFORMATION
ENGINE FAMILY :
THIS ENGINE CONFORMS TO 21 U.S. EPA REGULATIONS FOR MARINE SI ENGINES.
REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
g/kW-hr
FELs :
SPARK PLUG :
IDLE SPEED :
rpm IN NEUTRAL
Emergency equipment
SPARK PLUG GAP (mm) :
FUEL : GASOLINE
VALVE LASH (mm) :
3
DISPLACEMENT :
ADVERTISED POWER :
cm
kW
Keep the following items onboard in case
there is trouble with the motor.
● A tool kit with assorted screwdrivers, pli-
ers, wrenches (including metric sizes), and
electrical tape.
IN : N/A
EX : N/A
ZMU05230
EMU25262
● Waterproof flashlight with extra batteries.
● An extra engine shut-off cord (lanyard)
with clip.
● Spare parts, such as an extra set of spark
plugs.
Manufactured date label
This label is attached to the clamp bracket or
the swivel bracket.
Consult your Yamaha dealer for details.
EMU25221
Emission control information
EMU25230
North American models
This engine conforms to U.S. Environmental
Protection Agency (EPA) regulations for ma-
17
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Specifications and requirements
ZMU04893
1
1. Manufactured date label location
18
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Components
EMU2579H
Components diagram
TIP:
* May not be exactly as shown; also may not be included as standard equipment on all mod-
els.
70
12
13
15
1
2
11
10
14
16
9
8
7
6
3
4
5
ZMU04945
1. Top cowling
16. Fuel tank*
2. Top cowling lock lever
3. Anti-cavitation plate
4. Trim tab (anode)
5. Propeller
EMU25802
Fuel tank
If your model was equipped with a portable
fuel tank, its function is as follows.
EWM00020
6. Cooling water inlet
7. Anode
WARNING
8. Trim rod
9. Clamp bracket
10. Tilt support knob
11. Power trim and tilt switch
12. Tachometer*
13. Trim meter*
The fuel tank supplied with this engine is
its dedicated fuel reservoir and must not
be used as a fuel storage container. Com-
mercial users should conform to relevant
licensing or approval authority regula-
tions.
14. Digital tachometer*
15. Remote control box (side mount type)*
19
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Components
1
3
4
2
ZMU03157
1. Power trim and tilt switch
2. Remote control lever
3. Neutral interlock trigger
4. Neutral throttle lever
1. Fuel joint
2. Fuel gauge
3. Fuel tank cap
4. Air vent screw
5. Main switch / choke switch
6. Engine shut-off switch
7. Throttle friction adjuster
EMU25830
Fuel joint
This joint is used to connect the fuel line.
EMU25841
EMU26190
Remote control lever
Fuel gauge
Moving the lever forward from the neutral po-
sition engages forward gear. Pulling the le-
ver back from neutral engages reverse. The
engine will continue to run at idle until the le-
ver is moved about 35° (a detent can be felt).
Moving the lever farther opens the throttle,
and the engine will begin to accelerate.
This gauge is located on either the fuel tank
cap or on the fuel joint base. It shows the ap-
proximate amount of fuel remaining in the
tank.
EMU25850
Fuel tank cap
This cap seals the fuel tank. When removed,
the tank can be filled with fuel. To remove the
cap, turn it counterclockwise.
EMU25860
Air vent screw
This screw is on the fuel tank cap. To loosen
the screw, turn it counterclockwise.
EMU26181
Remote control box
The remote control lever actuates both the
shifter and the throttle. The electrical switch-
es are mounted on the remote control box.
1. Neutral “ ”
2. Forward “ ”
3. Reverse “ ”
4. Shift
5. Fully closed
20
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Components
6. Throttle
7. Fully open
EMU26201
Neutral interlock trigger
To shift out of neutral, first pull the neutral in-
terlock trigger up.
1. Fully open
2. Fully closed
EMU25911
Tiller handle
To change direction, move the tiller handle to
the left or right as necessary.
1. Neutral interlock trigger
EMU26211
Neutral throttle lever
To open the throttle without shifting into ei-
ther forward or reverse, put the remote con-
trol lever in the neutral position and lift the
neutral throttle lever.
TIP:
The neutral throttle lever will operate only
when the remote control lever is in neutral.
The remote control lever will operate only
when the neutral throttle lever is in the closed
position.
EMU25922
Gear shift lever
Pulling the gear shift lever towards you puts
the engine in forward gear so that the boat
moves ahead. Pushing the lever away from
you puts the engine in reverse gear so that
the boat moves astern.
21
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Components
1. Throttle indicator
1. Forward “ ”
2. Neutral “ ”
3. Reverse “ ”
EMU25973
Throttle friction adjuster
A friction device provides adjustable resis-
tance to movement of the throttle grip or the
remote control lever, and can be set accord-
ing to operator preference.
To increase resistance, turn the adjuster
clockwise. WARNING! Do not overtighten
the friction adjuster. If there is too much
resistance, it could be difficult to move
the remote control lever or throttle grip,
EMU25941
Throttle grip
The throttle grip is on the tiller handle. Turn
the grip counterclockwise to increase speed
and clockwise to decrease speed.
which could result in an accident.
[EWM00032]
To decrease resistance, turn the adjuster
counterclockwise.
EMU25961
Throttle indicator
The fuel consumption curve on the throttle
indicator shows the relative amount of fuel
consumed for each throttle position. Choose
the setting that offers the best performance
and fuel economy for the desired operation.
22
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Components
When constant speed is desired, tighten the
adjuster to maintain the desired throttle set-
1. Cord
2. Clip
3. Engine shut-off switch
ting.
EMU25993
Engine shut-off cord (lanyard) and
clip
The clip must be attached to the engine shut-
off switch for the engine to run. The cord
should be attached to a secure place on the
operator’s clothing, or arm or leg. Should the
operator fall overboard or leave the helm, the
cord will pull out the clip, stopping ignition to
the engine. This will prevent the boat from
running away under power. WARNING! At-
tach the engine shut-off cord to a secure
place on your clothing, or your arm or leg
while operating. Do not attach the cord to
clothing that could tear loose. Do not
route the cord where it could become en-
tangled, preventing it from functioning.
Avoid accidentally pulling the cord dur-
ing normal operation. Loss of engine
power means the loss of most steering
control. Also, without engine power, the
boat could slow rapidly. This could cause
people and objects in the boat to be
1. Cord
2. Clip
3. Engine shut-off switch
EMU26001
Engine stop button
To open the ignition circuit and stop the en-
gine, push this button.
thrown forward.
[EWM00122]
23
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Components
EMU26090
set according to operator preference. An ad-
justing screw or bolt is located on the clamp
bracket, on the right (starboard) side of the
through tube end.
To increase resistance, turn the adjuster
clockwise.
Main switch
The main switch controls the ignition system;
its operation is described below.
● “
With the main switch in the “
tion, the electrical circuits are off, and the key
can be removed.
” (off)
” (off) posi-
To decrease resistance, turn the adjuster
counterclockwise.
EWM00040
● “ ” (on)
With the main switch in the “ ” (on) posi-
tion, the electrical circuits are on, and the key
cannot be removed.
WARNING
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to steer, which could result in an
accident.
● “
” (start)
With the main switch in the “
” (start) po-
sition, the starter motor turns to start the en-
gine. When the key is released, it returns
automatically to the “ ” (on) position.
ZMU03245
EMU26143
Power trim and tilt switch on remote
control or tiller handle
The power trim and tilt system adjusts the
outboard motor angle in relation to the tran-
som. Pressing the switch “ ” (up) trims the
outboard motor up, and then tilts it up. Press-
ing the switch “ ” (down) tilts the outboard
motor down and trims it down. When the
switch is released, the outboard motor will
stop in its current position.
For instructions on using the power trim and
tilt switch, see pages 49 and 51.
EMU26130
Steering friction adjuster
A friction device provides adjustable resis-
tance to the steering mechanism, and can be
24
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Components
distract the operator, increasing the risk
of collision with another boat or an obsta-
cle.
UP
DOWN
ZMU03096
EMU26244
Trim tab with anode
EWM00840
WARNING
An improperly adjusted trim tab could
cause difficult steering. Always test run
after the trim tab has been installed or re-
placed to be sure steering is correct. Be
sure you have tightened the bolt after ad-
justing the trim tab.
EMU26153
Power trim and tilt switch on bottom
engine cowling
The power trim and tilt switch is located on
the side of the bottom engine cowling. Press-
ing the switch “ ” (up) trims the outboard
motor up, and then tilts it up. Pressing the
switch “ ” (down) tilts the outboard motor
down and trims it down. When the switch is
released, the outboard motor will stop in its
current position.
The trim tab should be adjusted so that the
steering control can be turned to either the
right or left by applying the same amount of
force.
If the boat tends to veer to the left (port side),
turn the trim tab rear end to the port side “A”
in the figure. If the boat tends to veer to the
right (starboard side), turn the trim tab end to
For instructions on using the power trim and
tilt switch, see page 51.
EWM01030
the starboard side “B” in the figure.
ECM00840
NOTICE
WARNING
The trim tab also serves as an anode to
protect the engine from electrochemical
corrosion. Never paint the trim tab as it
will become ineffective as an anode.
Use the power trim and tilt switch located
on the bottom engine cowling only when
the boat is at a complete stop with the en-
gine off. Attempting to use this switch
while the boat is moving could increase
the risk of falling overboard and could
25
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Components
A
1
B
2
ZMU03097
ZMU03194
ECM00660
1. Trim tab
2. Bolt
NOTICE
Do not use the tilt support lever or knob
when trailering the boat. The outboard
motor could shake loose from the tilt sup-
port and fall. If the motor cannot be trail-
ered in the normal running position, use
an additional support device to secure it
in the tilt position.
Bolt tightening torque:
36.0 Nm (3.6 kgf-m, 26 ft-lb)
EMU26261
Trim rod (tilt pin)
The position of the trim rod determines the
minimum trim angle of the outboard motor in
relation to the transom.
EMU26372
Top cowling lock lever(s) (turn type)
To remove the engine top cowling, turn the
lock lever(s) and lift off the cowling. When in-
stalling the cowling, check to be sure it fits
properly in the rubber seal. Then lock the
cowling again by returning the lever(s) to the
lock position.
ZMU02526
EMU26341
Tilt support lever for power trim and
tilt model
To keep the outboard motor in the tilted up
position, lock the tilt support lever to the
clamp bracket.
1
ZMU03827
1. Top cowling lock lever(s)
26
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Components
1
ZMU02596
1. Top cowling lock lever(s)
27
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Instruments and indicators
EMU31414
the power trim and tilt switch.
Digital tachometer
The tachometer shows the engine speed
and has the following functions.
● If the trim angle of your motor exceeds the
trim operating range, the top segment on
the trim meter display will blink.
All segments of the display will light momen-
tarily after the main switch is turned on and
will return to normal thereafter.
1
2
3
ZMU01869
EMU26651
4
5
Hour meter
7
6
ZMU01891
This meter shows the number of hours the
engine has been run. It can be set to show
the total number of hours or the number of
hours for the current trip. The display can
also be turned on and off.
1. Tachometer
2. Trim meter
3. Hour meter
4. Oil level indicator
5. Overheat-alert indicator
6. Set button
7. Mode button
TIP:
The water separator-alert indicator and en-
gine trouble-alert indicator on the digital ta-
chometer do not operate for this engine.
EMU36050
Tachometer
ZMU01870
The tachometer displays engine speed in
hundreds of revolutions per minute (r/min).
For example, if the tachometer display reads
“22” then the engine speed is 2200 r/min.
EMU26621
To change the display format, press the
“
” (mode) button. The display can show
total hours or trip hours, or turn off.
To reset the trip hours, simultaneously press
Trim meter
the “ ” (set) and “
” (mode) buttons for
This meter shows the trim angle of your out-
board motor.
● Memorize the trim angles that work best
for your boat under different conditions.
Adjust the trim angle to the desired using
more than 1 second while the trip hours are
displayed. This resets the trip counter to 0
(zero).
The total number of hours the engine has
been run cannot be reset.
28
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Instruments and indicators
EMU26551
Oil level indicator (digital type)
This indicator shows the engine oil level. If
the oil level falls below the lower limit, the
alert indicator will start to blink. For further in-
formation, see page 31.
ECM00030
1
NOTICE
Do not operate the engine without oil. Se-
rious engine damage will occur.
ZMU01868
1. Overheat-alert indicator
EMU26471
Analog tachometer
This gauge shows the engine speed and has
the following functions.
1
1
ZMU01867
1. Oil level indicator
EMU26583
2
Overheat-alert indicator
If the engine temperature rises too high, the
alert indicator will start to blink. For further in-
formation on reading the indicator, see page
31.
ECM00052
ZMU04577
1. Tachometer
2. Oil level indicator
NOTICE
EMU26541
Oil level indicators (three indicators)
The indicators on the gauge show the status
of the oil level. For details on how to read the
Do not continue to run the engine if the
overheat-alert indicator is on. Serious en-
gine damage will occur.
indicators, see page 42.
ECM00030
NOTICE
Do not operate the engine without oil. Se-
rious engine damage will occur.
29
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Instruments and indicators
1
ZMU04580
1. Oil level indicators
EMU26611
Analog trim meter
This gauge shows the trim angle of your out-
board motor.
ZMU04581
Memorize the trim angles that work best for
your boat under different conditions. Adjust
the trim angle to the desired setting with the
power trim and tilt switch.
30
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Engine control system
EMU26803
Alert system
ECM00091
NOTICE
Do not continue to operate the engine if a
alert device has activated. Consult your
Yamaha dealer if the problem cannot be
located and corrected.
EMU2681A
Overheat alert
This engine has an overheat-alert device. If
the engine temperature rises too high, the
alert device will activate.
● The engine speed will automatically de-
crease to about 2000 r/min.
If the alert system has activated, stop the en-
gine and check the cooling water inlets:
● Check trim angle to be sure that the cool-
ing water inlet is submerged.
● Check the cooling water inlet for clogging.
ZMU04766
ZMU03026
EMU26848
● The overheat-alert indicator will light or
Oil level alert and oil filter clogging
blink.
alert
Oil injection models
This engine has an oil level alert system. If
the oil level falls below the lower limit, the
alert system will activate.
Activation of alert device
● Engine speed will automatically decrease
to about 2000 r/min.
ZMU01757
● The buzzer will sound (if equipped on the
tiller handle, remote control box, or main
switch panel).
31
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Engine control system
make troubleshooting easier, check for en-
gine overheating first, then oil level, and fi-
nally oil filter clogging.
ZMU04586
1
● The oil level-alert indicator will light or
blink.
ZMU03828
1. Oil filter
ZMU03942
● The buzzer will sound (if equipped on the
tiller handle, remote control box, or main
switch panel).
If the alert system has been activated, stop
the engine and check for the cause.
TIP:
The alert for oil filter clogging is similar to the
alerts for low oil level and overheating. To
32
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Installation
EMU26902
Installation
The information presented in this section is
intended as reference only. It is not possible
to provide complete instructions for every
possible boat and motor combination. Prop-
er mounting depends in part on experience
and the specific boat and motor combination.
EWM01590
1
ZMU01760
WARNING
● Overpowering a boat could cause se-
vere instability. Do not install an out-
board motor with more horsepower
than the maximum rating on the capac-
ity plate of the boat. If the boat does not
have a capacity plate, consult the boat
manufacturer.
● Improper mounting of the outboard mo-
tor could result in hazardous condi-
tions such as poor handling, loss of
control, or fire hazards. For permanent-
ly mounted models, your dealer or oth-
er person experienced in proper
rigging should mount the motor.
1. Center line (keel line)
EMU26931
Mounting height (boat bottom)
The mounting height of your outboard motor
affects its efficiency and reliability. If it is
mounted too high, propeller ventilation may
occur, which will reduce propulsion due to
excessive propeller slip, and the water in-
takes for the cooling system may not get ad-
equate water supply, which can cause
engine overheating. If the engine is mounted
too low, water resistance (drag) will in-
crease, thereby reducing engine efficiency
and performance.
EMU33470
Most commonly, outboard motor should be
mounted so that the anti-cavitation plate is in
alignment with the bottom of the boat. The
optimum mounting height of the outboard
motor is affected by the boat/motor combina-
tion and the desired use. Test runs at differ-
ent heights can help determine the optimum
mounting height. Consult your Yamaha deal-
er or boat manufacturer for further informa-
tion on determining the proper mounting
height.
Mounting the outboard motor
The outboard motor should be mounted so
that the boat is well balanced. Otherwise, the
boat could be hard to steer. For single-en-
gine boats, mount the outboard motor on the
centerline (keel line) of the boat.
33
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Installation
ZMU01762
ECM01630
NOTICE
● During water testing, check the buoy-
ancy of the boat, at rest, with its maxi-
mum load. Check that the static water
level on the exhaust housing is low
enough to prevent water entry into the
power head when water rises due to
waves when the outboard is not run-
ning.
● Incorrect engine height or obstructions
to the smooth flow of water (such as the
design or condition of the boat, or ac-
cessories such as transom ladders or
depth finder transducers) can create
airborne water spray while the boat is
cruising. If the motor is operated con-
tinuously in the presence of airborne
water spray, enough water could enter
the engine through the intake opening
on the cowling to cause severe engine
damage. Eliminate the cause of the air-
borne water spray.
34
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Operation
EMU36380
EMU27020
Run the engine at the lowest possible
speed. A fast idle in neutral is best.
2. Next 50 minutes:
First-time operation
Breaking in engine
Do not exceed half throttle (approxi-
mately 3000 r/min). Vary engine speed
occasionally. If you have an easy-plan-
ing boat, accelerate at full throttle onto
plane, then immediately reduce the
throttle to 3000 r/min or less.
Your new engine requires a period of break-
in to allow mating surfaces of moving parts to
wear in evenly. Correct break-in will help en-
sure proper performance and longer engine
life.
ECM00140
3. Next two hours:
NOTICE
Accelerate at full throttle onto plane,
then reduce engine speed to three-quar-
ter throttle (approximately 4000 r/min).
Vary engine speed occasionally. Run at
full throttle for one minute, then allow
about 10 minutes of operation at three-
quarter throttle or less to let the engine
cool.
● Failure to follow the break-in procedure
could result in reduced engine life or
even severe engine damage.
● Premix fuel must be used during break-
in in addition to oil in the oil injection
system.
EMU27060
Gasoline and engine oil mixing chart
(50:1)
4. Remaining seven hours:
Run the engine at any speed. However,
avoid operating at full throttle for more
than 5 minutes at a time.
5. After the first 10 hours:
Operate the engine normally. Use only
straight gasoline in the fuel tank. The
Yamaha oil injection system provides
proper lubrication for normal operation.
EMU36400
1. : Gasoline
2. : Engine oil
Getting to know your boat
Different boats handle differently. Operate
cautiously while you learn how your boat
handles under different conditions and with
different trim angles (see page 49).
EMU36412
ECM00150
NOTICE
Be sure to mix gasoline and oil complete-
ly, otherwise the engine may be dam-
aged.
Checks before starting engine
EWM01920
WARNING
EMU30311
If any item in the checks before starting
engine is not working properly, have it in-
spected and repaired before operating
the outboard motor. Otherwise an acci-
Procedure for oil injection models
Run the engine under load (in gear with a
propeller installed) for 10 hours as follows.
1. First 10 minutes:
35
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Operation
EMU36440
dent could occur.
Fuel system
ECM00120
EWM00060
NOTICE
WARNING
Do not start the engine out of water. Over-
heating and serious engine damage can
occur.
Gasoline and its vapors are highly flam-
mable and explosive. Keep away from
sparks, cigarettes, flames, or other
sources of ignition.
EMU37141
Fuel level
EWM00910
Be sure you have plenty of fuel for your trip.
A good rule is to use 1/3 of your fuel to get to
the destination, 1/3 to return, and to keep 1/
3 as an emergency reserve. With the boat
level on a trailer or in the water, check the
fuel level. For fuel filling instructions, see
WARNING
Leaking fuel can result in fire or explo-
sion.
● Check for fuel leakage regularly.
● If any fuel leakage is found, the fuel
system must be repaired by a qualified
mechanic. Improper repairs can make
the outboard unsafe to operate.
page 40.
EMU36431
Remove cowling
EMU36450
For the following checks, remove the top
cowling from the engine. To remove the en-
gine cowling, release all the lock levers and
lift off the cowling.
Check for fuel leaks
● Check under top cowling and in the boat
for fuel leaks or gasoline fumes.
● Check fuel line connections to be sure they
are tight.
● Check fuel lines for cracks, swelling, or
other damage.
EMU37320
Check the fuel filter
Check that the fuel filter is clean and free of
water. If any water is found in the fuel, or if a
significant amount of debris is found, the fuel
tank should be checked and cleaned by a
Yamaha dealer.
ZMU06111
ZMU06087
36
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Operation
ZMU06184
EMU36900
1. Cord
Controls
2. Clip
Tiller handle models:
3. Engine shut-off switch
● Turn the tiller handle fully to the left and
right to make sure operation is smooth.
● Turn the throttle grip from the fully closed
to the fully open position. Make sure that it
turns smoothly and that it completely re-
turns to the fully closed position.
● Look for loose or damaged connections of
the throttle and shift cables under the en-
gine cowling.
Remote control models:
● Turn the steering wheel full-right and full-
left. Make sure operation is smooth and
unrestricted throughout the whole range
with no binding or excessive free play.
● Operate the throttle levers several times to
make sure there is no hesitation in their
travel. Operation should be smooth over
the complete range of motion, and each le-
ver should return completely to the idle po-
sition.
1. Cord
2. Clip
3. Engine shut-off switch
EMU27120
Oil
● Check to be sure you have plenty of oil for
your trip.
EMU27151
Engine
● Look for loose or damaged connections of
the throttle and shift cables under the en-
gine cowling.
EMU36481
● Check the engine and engine mounting.
● Look for loose or damaged fasteners.
● Check the propeller for damage.
● Check for oil leaks.
Engine shut-off cord (lanyard)
Inspect the engine shut-off cord for damage,
such as cuts, breaks, and wear.
EMU27171
Operation after a long period of
storage
When operating the engine after a long peri-
37
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Operation
od (12 months) of storage, proceed as fol-
lows:
1. Use a 50:1 gasoline-oil mixture to start
the engine.
2. Start the engine. Leave it idling.
WARNING! Do not touch or remove
electrical parts when starting or dur-
ing operation. Keep hands, hair, and
clothes away from the flywheel and
other rotating parts while the engine
rectly all the way around the engine.
5. Move the levers to lock the cowling as
shown. NOTICE: If the cowling is not
installed correctly, water spray under
the cowling can damage the engine,
or the cowling can blow off at high
speeds.
[ECM01990]
is running.
[EWM00091]
3. Watch for oil flowing through the oil feed
pipes. After any air in the oil lines has
been expelled, the oil injection system
should supply oil normally. If no oil is
flowing after 10 minutes of idling, consult
your Yamaha dealer.
ZMU06086
ZMU03829
ZMU06112
ECM00130
After installing, check the fitting of the top
cowling by pushing it with both hands. If the
top cowling is loose, have it repaired by your
Yamaha dealer.
NOTICE
Be sure to take the above steps when op-
erating the engine after a long period of
storage. Otherwise engine seizure could
occur.
EMU36961
Install cowling
1. Be sure that all cowling lock levers are
released.
2. Be sure that the rubber seal is seated all
the way around the engine.
3. Place the cowling on top of the seal.
4. Check to be sure the rubber seal fits cor-
38
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Operation
EMU29158
Checking power trim and tilt system
EWM01930
1
WARNING
● Never get under the lower unit while it
is tilted, even when the tilt support lever
is locked. Severe injury could occur if
the outboard motor accidentally falls.
● Body parts can be crushed between the
motor and the clamp bracket when the
motor is trimmed or tilted.
2
ZMU03129
1. Tilt support lever
2. Trim rods
● Be sure no one is near the outboard
motor before performing this check.
5. Check that the tilt rod and trim rods are
free of corrosion or other flaws.
6. Activate the tilt-down switch until the trim
rods have retracted completely into the
cylinders.
1. Check the power trim and tilt unit for any
sign of oil leaks.
2. Operate each of the power trim and tilt
switches on the remote control and en-
gine bottom cowling to check that all
switches work.
3. Tilt the outboard motor up and check
that the tilt rod and trim rods are extend-
ed completely.
3
1
ZMU03130
7. Activate the trim-up switch until the tilt
rod is fully extended. Unlock the tilt sup-
port lever.
8. Tilt the outboard motor down. Check
that the tilt rod and trim rods operate
2
ZMU03128
1. Tilt rod
smoothly.
EMU36581
2. Trim rods
3. Tilt support lever
Battery
Check that the battery is in good condition,
and fully charged. Check that the battery
connections are clean, secure and covered
by insulating covers. The electrical contacts
of the battery and cables must be clean and
4. Use the tilt support lever to lock the mo-
tor in the up position. Operate the tilt
down switch briefly so the motor is sup-
ported by the tilt support lever.
39
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Operation
properly connected or the battery will not
start the engine.
Refer to the battery manufacturer’s instruc-
tions for checks for your particular battery.
EMU27234
ture increases.
Fuel tank capacity:
25 L (6.60 US gal, 5.50 Imp.gal)
Filling fuel and engine oil
EMU27246
Filling fuel for portable tank
EWM01830
WARNING
● Gasoline and its vapors are highly flam-
mable and explosive. Always refuel ac-
cording to this procedure to reduce the
risk of fire and explosion.
ZMU03012
● Gasoline is poisonous and can cause
injury or death. Handle gasoline with
care. Never siphon gasoline by mouth.
If you should swallow some gasoline or
inhale a lot of gasoline vapor, or get
some gasoline in your eyes, see your
doctor immediately. If gasoline spills
on your skin, wash with soap and wa-
ter. If gasoline spills on your clothing,
change your clothes.
8. Tighten the filler cap securely.
9. Wipe up any spilled gasoline immediate-
ly with dry rags. Dispose rags properly.
According to local laws or regulations.
EMU27311
Filling oil for electric start models
EWM00530
WARNING
Do not add gasoline into the oil tank. Fire
or explosion could result.
1. Stop the engine.
This engine uses the Yamaha oil injection
system, which provides superior lubrication
by ensuring the proper oil ratio for all operat-
ing conditions. No fuel premixing is needed.
Simply pour gasoline into the fuel tank and
oil into the oil tank. Convenient indicator seg-
ments indicate the status of the oil supply.
For details on reading the indicator seg-
ments, see page 42.
2. Remove the portable tank from the boat.
3. Be sure you are in a well-ventilated out-
door area, either securely moored or
trailered.
4. Do not smoke and keep away from
sparks, flames, static electric discharge,
or other sources of ignition.
5. If you use a portable container to store
and dispense fuel, use only an approved
GASOLINE container.
To fill the engine oil tank, proceed as follows:
6. Touch the fuel nozzle to the filler open-
ing or funnel to help prevent electrostatic
sparks.
Engine oil tank capacity:
2.8 L (2.96 US qt, 2.46 Imp.qt)
7. Fill the fuel tank, but do not overfill. Fuel
can expand and overflow if the tempera-
1. Turn the oil filler access cap on the top
cowling counterclockwise and open it.
40
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Operation
ZMU03369
2. Open the oil tank filler cap by pulling the
tab on the cap.
ZMU03370
3. Slowly pour the engine oil into the en-
gine oil tank.
2
1
ZMU03371
1. Oil filler access cap
2. Oil tank filler cap
4. After filling, replace the all caps secure-
ly.
41
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Operation
EMU27321
Oil level indicator operation
The various functions of the oil level system are as follows:
EMU27364
Electric start models
Oil level-alert
Oil level-alert
indicator
(digital
tachometer)
indicator
(analog
tachometer/
bottom
Engine oil tank
Remarks
cowling)
Green
more than 770
3
No refilling necessary.
Add oil; see page 40.
cm (0.81 US qt,
0.68 Imp qt)
3
Yellow
from 770 cm
(0.81 US qt,
0.68 Imp qt) down
3
to 280 cm
(0.30 US qt,
0.25 Imp qt)
Red
● Buzzer sounds in
remote control box
and engine speed is
limited to about 2000
r/min to help con-
serve oil.
3
280 cm
(0.30 US qt,
0.25 Imp qt) or
less
● Check oil filter for
clogging.
EMU27451
are flammable and explosive. Refrain
from smoking, and keep away from
open flames and sparks while loosen-
ing the air vent screw.
Operating engine
EMU27464
Feeding fuel (portable tank)
EWM00420
● This product emits exhaust gases
which contain carbon monoxide, a col-
orless, odorless gas which could cause
brain damage or death when inhaled.
Symptoms include nausea, dizziness,
and drowsiness. Keep cockpit and cab-
in areas well ventilated. Avoid blocking
exhaust outlets.
WARNING
● Before starting the engine, make sure
that the boat is tightly moored and that
you can steer clear of any obstructions.
Be sure there are no swimmers in the
water near you.
● When the air vent screw is loosened,
gasoline vapor will be released. Gaso-
line is highly flammable, and its vapors
1. If there is an air vent screw on the fuel
42
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Operation
tank cap, loosen it 2 or 3 turns.
ZMU02022
1. Arrow
2. If there is a fuel joint on the motor, firmly
connect the fuel line to the joint. Then
firmly connect the other end of the fuel
line to the joint on the fuel tank.
EMU27492
Starting engine
EWM01600
WARNING
Before starting the engine, make sure
that the boat is tightly moored and that
you can steer clear of any obstructions.
Be sure there are no swimmers in the wa-
ter near you.
EMU27595
Electric start / prime start models
EWM01840
WARNING
ZMU03833
● Failure to attached engine shut-off cord
could result in a runaway boat if opera-
tor is ejected. Attach the engine shut-
off cord to a secure place on your cloth-
ing, or your arm or leg while operating.
Do not attach the cord to clothing that
could tear loose. Do not route the cord
where it could become entangled, pre-
venting it from functioning.
● Avoid accidentally pulling the cord dur-
ing normal operation. Loss of engine
power means the loss of most steering
control. Also, without engine power,
the boat could slow rapidly. This could
cause people and objects in the boat to
be thrown forward.
ZMU02024
3. Squeeze the primer pump, with the ar-
row pointing up, until you feel it become
firm. During engine operation place the
tank horizontally, otherwise fuel cannot
be drawn from the fuel tank.
43
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Operation
1. Place the gear shift lever in neutral.
4. Turn the main switch to “
” (start),
and hold it for a maximum of 5 seconds.
TIP:
The start-in-gear protection device prevents
the engine from starting except when in neu-
tral.
2. Attach the engine shut-off cord to a se-
cure place on your clothing, or your arm
or leg. Then install the clip on the other
end of the cord into the engine shut-off
switch.
5. Immediately after the engine starts, re-
lease the main switch and allow it to re-
turn to “ ” (on). NOTICE: Never turn
the main switch to “
” (start)
while the engine is running. Do not
keep the starter motor turning for
more than 5 seconds. If the starter
motor is turned continuously for
more than 5 seconds, the battery will
be quickly discharged, thus making it
impossible to start the engine. The
starter can also be damaged. If the
engine will not start after 5 seconds
of cranking, return the main switch to
3. Place the throttle grip in the “
”
(start) position. After the engine starts,
return the throttle to the fully closed po-
sition.
“
” (on), wait 10 seconds, then
crank the engine again.
[ECM00192]
TIP:
● When the engine is cold, it needs to be
warmed up. For further information, see
44
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Operation
page 46.
cure place on your clothing, or your arm
or leg. Then install the clip on the other
end of the cord into the engine shut-off
switch.
● If the engine is warm and fails to start,
open the throttle slightly and try to start the
engine again. If the engine still fails to
start, see page 71.
EMU27664
Electric start and remote control models
EWM01840
WARNING
● Failure to attached engine shut-off cord
could result in a runaway boat if opera-
tor is ejected. Attach the engine shut-
off cord to a secure place on your cloth-
ing, or your arm or leg while operating.
Do not attach the cord to clothing that
could tear loose. Do not route the cord
where it could become entangled, pre-
venting it from functioning.
ZMU03239
3. Turn the main switch to “ ” (on).
4. Turn the main switch to “
” (start),
and hold it for a maximum of 5 seconds.
● Avoid accidentally pulling the cord dur-
ing normal operation. Loss of engine
power means the loss of most steering
control. Also, without engine power,
the boat could slow rapidly. This could
cause people and objects in the boat to
be thrown forward.
1. Place the remote control lever in neutral.
5. Immediately after the engine starts, re-
lease the main switch and allow it to re-
turn to “ ” (on). NOTICE: Never turn
the main switch to “
” (start)
while the engine is running. Do not
keep the starter motor turning for
more than 5 seconds. If the starter
motor is turned continuously for
more than 5 seconds, the battery will
be quickly discharged, thus making it
impossible to start the engine. The
starter can also be damaged. If the
engine will not start after 5 seconds
of cranking, return the main switch to
TIP:
The start-in-gear protection device prevents
the engine from starting except when in neu-
tral.
2. Attach the engine shut-off cord to a se-
45
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Operation
“
” (on), wait 10 seconds, then
crank the engine again.
[ECM00192]
TIP:
● When the engine is cold, it needs to be
warmed up. For further information, see
page 46.
● If the engine is warm and fails to start,
open the throttle slightly and try to start the
engine again. If the engine still fails to
start, see page 71.
EMU36510
Check that no water leaks from the joints be-
tween the exhaust cover, cylinder head, and
body cylinder.
EMU27670
Checks after starting engine
EMU36520
Cooling water
Check for a steady flow of water from the
cooling water pilot hole. A continuous flow of
water from the pilot hole shows that the wa-
Warming up engine
EMU27704
Electric start and prime start models
ter pump is pumping water through the cool- After starting the engine, allow it to idle for 3
ing passages. If the cooling passages are minutes to warm up. Failure to do so will
frozen, it may take a while for water to start shorten engine life.
EMU36530
flowing out of the pilot hole.
ECM01810
Checks after engine warm-up
EMU36540
NOTICE
Shifting
If water is not flowing out of the pilot hole
at all times while the engine is running,
overheating and serious damage could
occur. Stop the engine and check wheth-
While tightly moored, and without applying
throttle, confirm that the engine shifts
smoothly into forward and reverse, and back
to neutral.
er the cooling water inlet on the lower
EMU36980
case or the cooling water pilot hole is
Stop switches
blocked. Consult your Yamaha dealer if
the problem cannot be located and cor-
rected.
● Turn the main switch to “
”, or press the
engine stop button and make sure the en-
gine stops.
● Confirm that removing the clip from the en-
gine shut-off switch stops the engine.
● Confirm that the engine cannot be started
with the clip removed from the engine
shut-off switch.
46
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Operation
EMU33492
EWM00180
Shifting
WARNING
Before shifting, make sure there are no
swimmers or obstacles in the water near
you.
ECM01610
NOTICE
Warm up the engine before shifting into
gear. Until the engine is warm, the idle
speed may be higher than normal. High
idle speed can prevent you from shifting
back to neutral. If this occurs, stop the
engine, shift to neutral, then restart the
engine and allow it to warm up.
To shift out of neutral
1. Pull the neutral interlock trigger up (if
equipped).
To shift from in gear (forward/reverse) to
neutral
1. Close the throttle so that the engine
slows to idle speed.
1. Neutral interlock trigger
2. Move the remote control lever / gear
shift lever firmly and crisply forward (for
forward gear) or backward (for reverse
gear) [about 35° (a detent can felt) for re-
mote control models].
47
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Operation
pact the steering wheel or other parts of
the boat. This could increase the risk of
serious injury. It could also damage the
shift mechanism.
● Do not shift into reverse while traveling
at planing speeds. Loss of control, boat
swamping, or damage to the boat could
occur.
The boat is not equipped with a separate
braking system. Water resistance stops it af-
ter the throttle lever is moved back to idle.
The stopping distance varies depending on
gross weight, water surface conditions, and
2. After the engine is at idle speed in gear
move the remote control lever / gear
shift lever firmly and crisply into the neu-
tral position.
wind direction.
EMU27821
Stopping engine
Before stopping the engine, first let it cool off
for a few minutes at idle or low speed. Stop-
ping the engine immediately after operating
at high speed is not recommended.
EMU27845
Procedure
1. Push and hold the engine stop button or
turn the main switch to “
” (off).
EMU31742
Stopping boat
EWM01510
WARNING
● Do not use the reverse function to slow
down or stop the boat as it could cause
you to lose control, be ejected, or im-
48
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Operation
ZMU02041
4. Remove the key if the boat will be left
unattended.
TIP:
The engine can also be stopped by pulling
the cord and removing the clip from the en-
gine shut-off switch, then turning the main
switch to “
EMU27862
” (off).
Trimming outboard motor
EWM00740
WARNING
2. After stopping the engine, disconnect
the fuel line if there is a fuel joint on the
outboard motor.
Excessive trim for the operating condi-
tions (either trim up or trim down) can
cause boat instability and can make
steering the boat more difficult. This in-
creases the possibility of an accident. If
the boat begins to feel unstable or is hard
to steer, slow down and/or readjust the
trim angle.
The trim angle of the outboard motor helps
determine the position of the bow of the boat
in the water. Correct trim angle will help im-
prove performance and fuel economy while
reducing strain on the engine. Correct trim
angle depends upon the combination of
boat, engine, and propeller. Correct trim is
also affected by variables such as the load in
the boat, sea conditions, and running speed.
ZMU03834
3. Tighten the air vent screw on the fuel
tank cap (if equipped).
49
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Operation
UP
DN
1
ZMU03110
1. Trim operating angle
1. Power trim and tilt switch
EMU27884
Adjusting trim angle (Power trim and
tilt)
EWM00753
WARNING
● Be sure all people are clear of the out-
board motor when adjusting the trim
angle. Body parts can be crushed be-
tween the motor and the clamp bracket
when the motor is trimmed or tilted.
● Use caution when trying a trim position
for the first time. Increase speed gradu-
ally and watch for any signs of instabil-
ity or control problems. Improper trim
angle can cause loss of control.
1. Power trim and tilt switch
● If equipped with a power trim and tilt
switch located on the bottom cowling,
use the switch only when the boat is at
a complete stop with the engine off. Do
not adjust the trim angle with this
switch while the boat is moving.
UP
DN
1
ZMU04515
Adjust the outboard motor trim angle using
the power trim and tilt switch.
1. Power trim and tilt switch
To raise the bow (trim-out), press the switch
” (up).
To lower the bow (trim-in), press the switch
” (down).
Make test runs with the trim set to different
“
“
50
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Operation
angles to find the position that works best for
your boat and operating conditions.
EMU27911
Adjusting boat trim
When the boat is on plane, a bow-up attitude
results in less drag, greater stability and effi-
ciency. This is generally when the keel line of
the boat is up about 3 to 5 degrees. With the
bow up, the boat may have a greater tenden-
cy to steer to one side or the other. Compen-
sate for this as you steer. The trim tab can
also be adjusted to help offset this effect.
When the bow of the boat is down, it is easier
to accelerate from a standing start onto
plane.
Bow Down
Too much trim-in causes the boat to “plow”
through the water, decreasing fuel economy
and making it hard to increase speed. Oper-
ating with excessive trim-in at higher speeds
also makes the boat unstable. Resistance at
the bow is greatly increased, heightening the
danger of “bow steering” and making opera-
tion difficult and dangerous.
Bow Up
Too much trim-out puts the bow of the boat
too high in the water. Performance and econ-
omy are decreased because the hull of the
boat is pushing the water and there is more
air drag. Excessive trim-out can also cause
the propeller to ventilate, which reduces per-
formance further, and the boat may “por-
poise” (hop in the water), which could throw
the operator and passengers overboard.
TIP:
Depending on the type of boat, the outboard
motor trim angle may have little effect on the
trim of the boat when operating.
EMU27934
Tilting up and down
If the engine will be stopped for some time or
if the boat is moored in shallows, the out-
board motor should be tilted up to protect the
propeller and lower casing from damage by
collision with obstructions, and also to re-
51
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Operation
duce salt corrosion.
EWM00221
WARNING
Be sure all people are clear of the out-
board motor when tilting up and down,
Body parts can be crushed between the
motor and the clamp bracket when the
motor is trimmed or tilted.
EWM00250
WARNING
2. Press the power trim and tilt switch “
”
Leaking fuel is a fire hazard. If there is a
fuel joint on the outboard motor, discon-
nect the fuel line or close the fuel cock if
the engine will be tilted for more than a
few minutes. Otherwise fuel may leak.
(up) until the outboard motor has tilted
up completely.
ECM00241
NOTICE
● Before tilting the outboard motor, stop
the engine by following the procedure
on page 48. Never tilt the outboard mo-
tor while the engine is running. Severe
damage from overheating can result.
● Do not tilt up the engine by pushing the
tiller handle (if equipped) because this
could break the handle.
EMU32723
Procedure for tilting up (power trim
and tilt models)
1. Place the remote control lever / gear
shift lever in neutral.
N
ZMU03196
52
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Operation
and tilt switch “ ” (down) to retract the
trim rods. NOTICE: Be sure to retract
the trim rods completely during
mooring. This protects the rods from
marine growth and corrosion which
could damage the power trim and tilt
UP
mechanism.
[ECM00251]
ZMU03837
3. Pull the tilt support lever toward you to
support the engine. WARNING! After
tilting the outboard motor, be sure to
support it with the tilt support knob or
tilt support lever. Otherwise the out-
board motor could fall back down
suddenly if oil in the power trim and
tilt unit or in the power tilt unit loses
ZMU03116
EMU33120
Procedure for tilting down (power
trim and tilt models)
1. Push the power trim and tilt switch “
pressure.
[EWM00262]
NOTICE: Do not use
the tilt support lever or knob when
trailering the boat. The outboard mo-
tor could shake loose from the tilt
support and fall. If the motor cannot
be trailered in the normal running po-
sition, use an additional support de-
vice to secure it in the tilt position.
For more detailed information, see
”
(up) until the outboard motor is support-
ed by the tilt rod and the tilt support lever
becomes free.
2. Release the tilt support lever.
page 56.
[ECM01641]
ZMU02569
3. Push the power trim and tilt switch “
”
(down) to lower the outboard motor to
the desired position.
ZMU03115
4. Models equipped with trim rods: Once
the outboard motor is supported with the
tilt support lever, press the power trim
53
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Operation
ting up for and cruising in shallow water.
Otherwise severe damage from overheat-
ing can result.
UP
DN
EMU32912
DN
Procedure for power trim and tilt models
1. Place the remote control lever / gear
shift lever in neutral.
ZMU01936
DN
2. Slightly tilt the outboard motor up to the
desired position using the power trim
and tilt switch. WARNING! Using the
power trim and tilt switch on the bot-
tom cowling while the boat is moving
or engine is on could increase the
risk of falling overboard and could
distract the operator, increasing the
risk of collision with another boat or
ZMU03838
EMU28061
Shallow water
EMU32851
Power trim and tilt models
The outboard motor can be tilted up partially
to allow operation in shallow water.
ECM00260
an obstacle.
[EWM01850]
NOTICE
Do not tilt the outboard motor up so that
the cooling water inlet on the lower unit is
above the surface of the water when set-
54
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Operation
3. To return the outboard motor to the nor-
mal running position, press the power
trim and tilt switch and slowly tilt the out-
board motor down.
EMU28194
UP
DN
UP
Cruising in other conditions
Cruising in salt water
After operating in salt water, flush the cooling
water passages with fresh water to prevent
them from becoming clogged. Also rinse the
outside of the outboard motor with fresh wa-
ter and, if possible, rinse the power head un-
der the cowling.
ZMU01935
Cruising in muddy, turbid, or acidic water
Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(see page 16) if you use the outboard motor
in acidic water or water with a lot of sediment
in it, such as muddy or turbid (cloudy) water.
After operating in such water, flush the cool-
ing passages with fresh water to prevent cor-
rosion. Also rinse the outside of the outboard
motor with fresh water.
UP
ZMU03847
55
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Maintenance
EMU28226
Transporting and storing
outboard motor
EWM00692
WARNING
● USE CARE when transporting fuel tank,
whether in a boat or car.
● DO NOT fill fuel container to maximum
capacity. Gasoline will expand consid-
erably as it warms up and can build up
pressure in the fuel container. This can
cause fuel leakage and a potential fire
hazard.
ZMU03839
EMU30272
Storing outboard motor
When storing your Yamaha outboard motor
for prolonged periods of time (2 months or
longer), several important procedures must
be performed to prevent excessive damage.
It is advisable to have your outboard motor
serviced by an authorized Yamaha dealer
prior to storage. However, you, the owner,
with a minimum of tools, can perform the fol-
EWM01860
WARNING
Leaking fuel is a fire hazard. When trans-
porting and storing the outboard motor,
close the fuel cock to prevent fuel from
leaking. Never get under the engine while
it is tilted. Severe injury could occur if the
outboard motor accidentally falls.
lowing procedures.
ECM01411
ECM00660
NOTICE
NOTICE
● Do not place the outboard motor on its
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble.
Do not use the tilt support lever or knob
when trailering the boat. The outboard
motor could shake loose from the tilt sup-
port and fall. If the motor cannot be trail-
ered in the normal running position, use
an additional support device to secure it
in the tilt position.
● Store the outboard motor in a dry, well-
ventilated place, not in direct sunlight.
EMU28303
The outboard motor should be trailered and
stored in the normal running position. If there
is insufficient road clearance in this position,
then trailer the outboard motor in the tilt po-
sition using a motor support device such as
a transom saver bar. Consult your Yamaha
dealer for further details.
Procedure
EMU28383
Flushing with the flushing attachment
1. Wash the outboard motor body using
fresh water. NOTICE: Do not spray wa-
ter into the air intake.
ther information, see page 58.
[ECM01840]
For fur-
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
56
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Maintenance
and Stabilizer” to each gallon of fuel.
WARNING! Do not touch or remove
electrical parts when starting or dur-
ing operation. Keep hands, hair, and
clothes away from the flywheel and
other rotating parts while the engine
TIP:
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is
to be drained instead.
is running.
[EWM00091]
6. Run the engine at a fast idle for 10–15
minutes in neutral position while supply-
ing fresh water.
3. Remove the top cowling and silencer
cover/cap. Remove the propeller.
7. Just prior to turning off the engine, quick-
ly spray “Yamaha Stor-Rite Engine
Fogging Oil” alternately into each carbu-
retor/each intake manifold. When prop-
erly done, the engine will smoke
excessively and almost stall.
4. Install the flushing attachment over the
cooling water inlet. NOTICE: Do not run
the engine without supplying it with
cooling water. Either the engine wa-
ter pump will be damaged or the en-
gine
will
be
damaged
from
8. Remove the flushing attachment and
wipe off any excess water.
9. Install the silencer cover/cap and top
cowling. Install the propeller.
overheating. Before starting the en-
gine, be sure to supply water to the
cooling water passages. Avoid run-
ning the outboard motor at high
speed while on the flushing attach-
TIP:
ment, otherwise overheating could A flushing attachment is available from your
occur.
[ECM02000]
Yamaha dealer.
EMU28411
Lubrication (oil injection models)
1. Install the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 63.
2. Fill the oil tanks. This prevents the for-
mation of condensation. For models with
a remote oil tank, it may be necessary to
manually override the control unit to
completely fill the engine oil tank.
3. Change the gear oil. For instructions,
see page 67. Inspect the oil for the pres-
ence of water which indicates a leaky
seal. Seal replacement should be per-
formed by an authorized Yamaha dealer
prior to use.
1. Flushing attachment
5. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging/lubricating of the engine is
mandatory to prevent excessive engine
damage due to rust. Perform the flush-
ing and fogging at the same time.
4. Grease all grease fittings. For further de-
tails, see page 63.
57
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Maintenance
EMU2848A
EWM01871
TIP:
Periodic maintenance
For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
WARNING
These procedures require mechanical
skills, tools, and supplies. If you do not
have the proper skills, tools, or supplies
to perform a maintenance procedure,
have a Yamaha dealer or other qualified
mechanic do the work.
The procedures involve disassembling
the motor and exposing dangerous parts.
To reduce the risk of injury from moving,
hot, or electrical parts:
oil and procedures for your engine.
EMU28423
Cleaning and anticorrosion
measures
1. Wash down the exterior of the outboard
motor with fresh water and dry off com-
pletely. NOTICE: Do not spray water
into the air intake.
[ECM01840]
2. Spray the outboard motor exterior with
“Yamaha Silicone Protectant”.
● Turn off the engine and keep the key(s)
and engine shut-off cord (lanyard) with
you when you perform maintenance
unless otherwise specified.
● The power trim and tilt switches oper-
ate even when the ignition key is off.
Keep people away from the switches
whenever working around the motor.
When the motor is tilted, keep away
from the area under it or between it and
the clamp bracket. Be sure no one is in
this area before operating the power
trim and tilt mechanism.
3. Wax the cowling with a non-abrasive
wax such as “Yamaha Silicone Wax”.
EMU28450
Cleaning the outboard motor
After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling
system with fresh water.
● Allow the engine to cool before han-
dling hot parts or fluids.
● Always completely reassemble the mo-
tor before operation.
TIP:
Maintenance, replacement, or repair of
the emission control devices and sys-
tems may be performed by any marine
engine repair establishment or individual.
All warranty repairs, however, including
those to the emission control system,
must be performed by an authorized
Yamaha marine dealership.
For cooling system flushing instructions, see
page 56.
EMU28460
Checking painted surface of motor
Check the motor for scratches, nicks, or flak-
ing paint. Areas with damaged paint are
more likely to corrode. If necessary, clean
and paint the areas. A touch-up paint is avail-
able from your Yamaha dealer.
A service manual is available for purchase
through your Yamaha dealer for owners who
58
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Maintenance
have the mechanical skills, tools, and other
equipment necessary to perform mainte-
nance not covered by this owner’s manual.
EMU28511
Replacement parts
If replacement parts are necessary, use only
genuine Yamaha parts or parts of equivalent
design and quality. Any part of inferior quality
may malfunction, and the resulting loss of
control could endanger the operator and
passengers. Yamaha genuine parts and ac-
cessories are available from your Yamaha
dealer.
EMU34150
Severe operating conditions
Severe operating conditions involve one or
more of the following types of operation on a
regular basis:
● Operating continuously at or near maxi-
mum engine speed (rpm) for many hours
● Operating continuously at a low engine
speed (rpm) for many hours
● Brief periods of rapid acceleration and de-
celeration followed by engine shut off be-
fore the engine has reached proper
operating temperature
● Frequent quick acceleration and decelera-
tion
● Frequent shifting
● Frequently starting and stopping the en-
gine(s)
● Operation that fluctuates often between
light and heavy cargo loads
Outboard motors operating under any of
these above conditions require more fre-
quent maintenance. Yamaha recommends
that you do this service twice as often as
specified in the maintenance chart. For ex-
ample, if a particular service should be done
at 50 hours, do it instead at 25 hours. This
will help prevent more rapid deterioration of
engine components.
59
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Maintenance
EMU34445
Maintenance chart 1
TIP:
● Refer to the sections in this chapter for explanations of each owner-specific action.
● The maintenance cycle on these charts assume usage of 100 hours per year and regular
flushing of the cooling water passages. Maintenance frequency should be adjusted when
operating the engine under adverse conditions such as extended trolling.
● Disassembly or repairs may be necessary depending on the outcome of maintenance
checks.
● Expendable or consumable parts and lubricants will lose their effectiveness over time and
through normal usage regardless of the warranty period.
● When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine should
be flushed with clean water after each use.
The “ ” symbol indicates the check-ups which you may carry out yourself.
The “ ” symbol indicates work to be carried out by your Yamaha dealer.
Initial
Every
20 hours
(3
months)
100
hours (1
year)
300
hours (3
years)
500
hours (5
years)
Item
Actions
Inspection or replace-
ment as necessary
Anode(s) (external)
Anode(s) (cylinder
head, thermostat
cover)
Inspection or replace-
ment as necessary
Anodes (exhaust cover,
cooling water passage
cover, Rectifier Regula-
tor cover)
Battery (electrolyte
level, terminal)
Replacement
Inspection
Battery (electrolyte
level, terminal)
Fill, charging or replac-
ing as necessary
Inspection or replace-
ment as necessary
Cooling water leakage
Cowling clamp
Inspection
Engine starting condi-
tion/Noise
Inspection
Engine idling speed/
Noise
Inspection
Fuel filter (can be dis-
assembled)
Inspection or replace-
ment as necessary
Fuel line(High pres-
sure)
Inspection
60
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Maintenance
Initial
Every
20 hours
(3
months)
100
hours (1
year)
300
hours (3
years)
500
hours (5
years)
Item
Actions
Fuel line(High pres-
sure)
Inspection or replace-
ment as necessary
Fuel line(Low pres-
sure)
Inspection
Fuel line(Low pres-
sure)
Inspection or replace-
ment as necessary
Inspection or replace-
ment as necessary
Fuel pump
Fuel/oil leakage
Gear oil
Inspection
Replacement
Greasing
Greasing points
Impeller/water pump
housing
Inspection or replace-
ment as necessary
Impeller/water pump
housing
Replacement
Oil tank water drain
Inspection or cleaning
Oil injection pump/oil
feed pump
Inspection or Adjust-
ment
Power trim & tilt unit/
Operation,noise and oil Inspection
leakage
Propeller/Propeller nut/ Inspection or replace-
Cotter pin
PCV (Pressure Con-
trol Valve)
ment as necessary
Inspection or replace-
ment as necessary
Inspection, adjustment
or replacement as nec-
essary
Shift link/shift cable
Inspection or replace-
ment as necessary
Inspection or replace-
ment as necessary
Spark plug(s)
Spark plug caps/high
tension cords
Water from the cooling
water pilot hole
Inspection
Throttle link/Throttle
cable/Throttle pick-up
timing
Inspection, adjustment
or replacement as nec-
essary
Inspection or replace-
ment as necessary
Thermostat
61
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Maintenance
Initial
Every
20 hours
(3
months)
100
hours (1
year)
300
hours (3
years)
500
hours (5
years)
Item
Actions
Water inlet
Inspection
Main switch/stop
switch/choke switch
Wire harness connec-
tions/Wire coupler con-
nections
Inspection or replace-
ment as necessary
Inspection or replace-
ment as necessary
(Yamaha) Meter/gauge Inspection
Inspection and clean-
ing as necessary
(Yamaha) Fuel tank
EMU34451
Maintenance chart 2
Every
1000 hours
Item
Actions
Guide exhaust/exhaust Inspection or replace-
manifold ment as necessary
62
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Maintenance
EMU28932
Greasing
Yamaha marine grease (Water resistant grease)
70
ZMU03125
EMU28955
other deposits are excessive, you should re-
Cleaning and adjusting spark plug
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak or
carburetion problem in that cylinder. Do not
attempt to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically re-
move and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode. If electrode
erosion becomes excessive, or if carbon and
place the spark plug with another of the cor-
rect type.
1. Remove the spark plug caps from the
spark plugs.
2. Remove the spark plug. If electrode ero-
sion becomes excessive, or if carbon
and other deposits are excessive, you
should replace the spark plug with an-
other of the correct type. WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
allow external sparks, which could
63
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Maintenance
EMU37450
lead to explosion or fire.
[EWM00561]
Checking fuel filter
Standard spark plug:
B8HS-10
Check the fuel filter periodically. If any water
or foreign matter is found in the filter, clean or
replace it. For cleaning or replacement of the
fuel filter, consult your Yamaha dealer.
3. Be sure to use the specified spark plug,
otherwise the engine may not operate
properly. Before fitting the spark plug,
measure the electrode gap with a wire
thickness gauge; adjust the gap to spec-
ification if necessary.
ZMU06184
EMU29041
Inspecting idling speed
EWM00451
WARNING
● Do not touch or remove electrical parts
when starting or during operation.
1. Spark plug gap
2. Spark plug I.D. mark (NGK)
3. Spark plug part number
● Keep hands, hair, and clothes away
from the flywheel and other rotating
parts while the engine is running.
Spark plug gap:
ECM00490
0.9–1.0 mm (0.035–0.039 in)
NOTICE
This procedure must be performed while
the outboard motor is in the water. A
flushing attachment or test tank can be
used.
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
Spark plug torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
A diagnostic tachometer should be used for
this procedure. Results may vary depending
on whether testing is conducted with the
flushing attachment, in a test tank, or with the
outboard motor in the water.
1. Start the engine and allow it to warm up
fully in neutral until it is running smooth-
ly.
TIP:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past fin-
ger-tight. Have the spark plug adjusted to the
correct torque as soon as possible with a
torque-wrench.
64
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Maintenance
TIP:
Correct idling speed inspection is only possi-
ble if the engine is fully warmed up. If not
warmed up fully, the idle speed will measure
higher than normal. If you have difficulty ver-
ifying the idle speed, or the idle speed re-
quires adjustment, consult a Yamaha dealer
or other qualified mechanic.
2. Verify whether the idle speed is set to
specification. For idle speed specifica-
ZMU03841
EMU32111
tions, see page 13.
EMU29061
Checking propeller
EWM01880
Checking water in engine oil tank
A translucent water drain hose is connected
from the bottom of the oil tank to the filler
neck. If water or foreign matter collects in this
hose, consult a Yamaha dealer.
WARNING
You could be seriously injured if the en-
gine accidentally starts when you are
near the propeller.
● Before inspecting, removing, or install-
ing the propeller, place the shift control
2
in neutral, turn the main switch to “
”
(off) and remove the key, and remove
the clip from the engine shut-off switch.
Turn off the battery cut-off switch if
your boat has one.
1
Do not use your hand to hold the propeller
when loosening or tightening the propeller
nut. Put a wood block between the anti-cavi-
tation plate and the propeller to prevent the
propeller from turning.
ZMU03898
1. Drain hose
2. Filler neck side
EMU29112
Checking wiring and connectors
● Check that each grounding wire is properly
secured.
● Check that each connector is engaged se-
curely.
ZMU01897
Checkpoints
65
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Maintenance
● Check each of the propeller blades for
wear, erosion from cavitation or ventila-
tion, or other damage.
● Check the propeller shaft for damage.
● Check the splines for wear or damage.
● Check for fish line tangled around the pro-
peller shaft.
2. Propeller nut
3. Washer
4. Spacer
5. Propeller
6. Thrust washer
1
3
6
2
4
5
ZMU03842
1. Cotter pin
2. Propeller nut
3. Washer
● Check the propeller shaft oil seal for dam-
age.
EMU30661
4. Spacer
5. Propeller
6. Thrust washer
Removing propeller
EMU29197
Spline models
1. Straighten the cotter pin and pull it out
3. Remove the propeller, washer (if
equipped), and thrust washer.
EMU30671
using a pair of pliers.
2. Remove the propeller nut, washer, and
spacer (if equipped). WARNING! Do
not use your hand to hold the propel-
ler when loosening the propeller nut.
[EWM01890]
Installing propeller
EMU29233
Spline models
ECM00500
NOTICE
Be sure to use a new cotter pin and bend
the ends over securely. Otherwise the
propeller could come off during opera-
tion and be lost.
1
2
1. Apply Yamaha marine grease or a cor-
rosion resistant grease to the propeller
shaft.
3
4
6
5
2. Install the spacer (if equipped), thrust
washer, washer (if equipped), and pro-
peller on the propeller shaft. NOTICE:
Be sure to install the thrust washer
ZMU03131
1. Cotter pin
66
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Maintenance
before installing the propeller, other-
wise the lower case and propeller
occur if the outboard motor accidental-
ly falls.
boss could be damaged.
[ECM01880]
1. Tilt the outboard motor so that the gear
oil drain screw is at the lowest point pos-
sible.
2. Place a suitable container under the
gear case.
3. Remove the gear oil drain screw and
gasket. NOTICE: If there is an exces-
sive quantity of metal particles on the
magnetic gear oil drain screw, this
can indicate lower unit problem. Con-
3. Install the spacer (if equipped) and the
washer. Tighten the propeller nut to the
specified torque.
Propeller nut tightening torque:
35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
4. Align the propeller nut with the propeller
shaft hole. Insert a new cotter pin in the
hole and bend the cotter pin ends. NO-
TICE: Do not reuse the cotter pin in-
stalled. Otherwise the propeller can
sult your Yamaha dealer.
[ECM01900]
come off during operation.
[ECM01890]
2
1
ZMU03133
1. Gear oil drain screw
2. Oil level plug
TIP:
TIP:
If the propeller nut does not align with the
propeller shaft hole after tightening to the
specified torque, tighten the nut further to
align it with the hole.
EMU29287
● If a magnetic gear oil drain screw is
equipped, remove all metal particles from
the screw before installing it.
● Always use new gaskets. Do not reuse the
removed gaskets.
Changing gear oil
EWM00800
4. Remove the oil level plug and gasket to
allow the oil to drain completely. NO-
TICE: Inspect the used oil after it has
been drained. If the oil is milky, water
is getting into the gear case which
can cause gear damage. Consult a
Yamaha dealer for repair of the lower
WARNING
● Be sure the outboard motor is securely
fastened to the transom or a stable
stand. You could be severely injured if
the outboard motor falls on you.
● Never get under the lower unit while it
is tilted, even when the tilt support lever
or knob is locked. Severe injury could
unit seals.
[ECM00711]
67
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Maintenance
pors are flammable and explosive.
● If you have any question about properly
doing this procedure, consult your
Yamaha dealer.
● Keep away from sparks, cigarettes,
flames, or other sources of ignition
when cleaning the fuel tank.
TIP:
For disposal of used oil, consult your
Yamaha dealer.
5. Put the outboard motor in a vertical po-
sition. Using a flexible or pressurized fill-
ing device, inject the gear oil into the
gear oil drain screw hole.
● Remove the fuel tank from the boat be-
fore cleaning it. Work only outdoors in
an area with good ventilation.
● Wipe up any spilled fuel immediately.
● Reassemble the fuel tank carefully. Im-
proper assembly can result in a fuel
leak, which could result in a fire or ex-
plosion hazard.
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
0.610 L (0.645 US qt, 0.537 Imp.qt)
● Dispose of old gasoline according to lo-
cal regulations.
1. Empty the fuel tank into an approved
container.
2. Pour a small amount of suitable solvent
into the tank. Install the cap and shake
the tank. Drain the solvent completely.
3. Remove the screws holding the fuel joint
assembly. Pull the assembly out of the
tank.
ZMU03132
6. Put a new gasket on the oil level plug.
When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
Tightening torque:
9 Nm (0.9 kgf-m, 6.6 ft-lb)
7. Put a new gasket on the gear oil drain
screw. Insert and tighten the gear oil
drain screw.
ZMU02066
Tightening torque:
9 Nm (0.9 kgf-m, 6.6 ft-lb)
4. Clean the filter (located on the end of the
suction pipe) in a suitable cleaning sol-
vent. Allow the filter to dry.
5. Replace the gasket with a new one. Re-
install the fuel joint assembly and tighten
EMU29302
Cleaning fuel tank
EWM00920
WARNING
Gasoline is highly flammable, and its va-
68
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Maintenance
EMU29322
the screws firmly.
EMU29312
Checking battery (for electric start
Inspecting and replacing anode(s)
Yamaha outboard motors are protected from
corrosion by sacrificial anodes. Inspect the
external anodes periodically. Remove scales
from the surfaces of the anodes. Consult a
Yamaha dealer for replacement of external
models)
EWM01900
WARNING
Battery electrolytic fluid is poisonous
and caustic, and batteries generate ex-
plosive hydrogen gas. When working
near the battery:
● Wear protective eye gear and rubber
gloves.
anodes.
ECM00720
NOTICE
Do not paint anodes, as this would render
them ineffective.
● Do not smoke or bring any other source
of ignition near the battery.
Refer to page 14 for detailed safety infor-
mation about batteries.
TIP:
Inspect ground leads attached to external
anodes on equipped models. Consult a
Yamaha dealer for inspection and replace-
ment of internal anodes attached to the pow-
er unit.
The procedure for checking the battery var-
ies for different batteries. This procedure
contains typical checks that apply to many
batteries, but you should always refer to the
battery manufacturer’s instructions.
ECM01920
NOTICE
A poorly maintained battery will quickly
deteriorate.
1. Check the electrolyte level.
ZMU01901
2. Check the battery’s charge. If your boat
is equipped with the digital speedome-
ter, the voltmeter and low battery alert
functions will help you monitor the bat-
tery’s charge. If the battery needs charg-
ZMU02559
69
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Maintenance
ing, consult your Yamaha dealer.
3. Check the battery connections. They
should be clean, secure, and covered by
an insulating cover. WARNING! Bad
connections can produce shorting or
arcing and cause an explosion.
cables must be clean and properly con-
nected, or the battery will not start the
engine.
EMU29371
Disconnecting the battery
1. Turn off the battery cut-off switch (if
equipped) and main switch. NOTICE: If
they are left on, the electrical system
[EWM01910]
EMU29333
Connecting the battery
can be damaged.
[ECM01930]
EWM00570
2. Disconnect the negative cable(s) from
the negative (-) terminal. NOTICE: Al-
ways disconnect all negative (-) ca-
bles first to avoid a short circuit and
damage to the electrical system.
[ECM01940]
WARNING
Mount the battery holder securely in a
dry, well-ventilated, vibration-free loca-
tion in the boat. Install a fully charged bat-
tery in the holder.
3. Disconnect the positive cable(s) and re-
move the battery from the boat.
4. Clean, maintain, and store the battery
according to the manufacturer’s instruc-
tions.
ECM01123
NOTICE
Reversal of the battery cables will dam-
age the electrical parts.
1. Make sure the main switch (on applica-
ble models) is “
on the battery.
” (off) before working
2. Connect the red battery cable to the
POSITIVE (+) terminal first. Then con-
nect the black battery cable to the NEG-
ATIVE (-) terminal.
1. Red cable
2. Black cable
3. Battery
3. The electrical contacts of the battery and
70
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Trouble Recovery
EMU29427
A. Fill tank with clean, fresh fuel.
Troubleshooting
A problem in the fuel, compression, or igni-
tion systems can cause poor starting, loss of
power, or other problems. This section de-
scribes basic checks and possible remedies,
and covers all Yamaha outboard motors.
Therefore some items may not apply to your
model.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is starting procedure incorrect?
A. See page 43.
Q. Has fuel pump malfunctioned?
If your outboard motor requires repair, bring
it to your Yamaha dealer.
A. Have serviced by a Yamaha dealer.
If the engine trouble-alert indicator is flash-
ing, consult your Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
Starter will not operate.
Q. Is battery capacity weak or low?
A. Check battery condition. Use battery of
recommended capacity.
Q. Are spark plug cap(s) fitted incorrectly?
A. Check and re-fit cap(s).
Q. Are battery connections loose or corrod-
ed?
Q. Is ignition wiring damaged or poorly con-
nected?
A. Tighten battery cables and clean battery
terminals.
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken wires.
Q. Is fuse for electric start relay or electric cir-
cuit blown?
Q. Are ignition parts faulty?
A. Check for cause of electric overload and
repair. Replace fuse with one of correct am-
perage.
A. Have serviced by a Yamaha dealer.
Q. Is engine shut-off cord (lanyard) not at-
tached?
Q. Are starter components faulty?
A. Attach cord.
A. Have serviced by a Yamaha dealer.
Q. Are engine inner parts damaged?
A. Have serviced by a Yamaha dealer.
Q. Is shift lever in gear?
A. Shift to neutral.
Engine idles irregularly or stalls.
Q. Are spark plug(s) fouled or of incorrect
type?
Engine will not start (starter operates).
Q. Is fuel tank empty?
A. Fill tank with clean, fresh fuel.
A. Inspect spark plug(s). Clean or replace
with recommended type.
Q. Is fuel contaminated or stale?
71
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Trouble Recovery
Q. Is fuel system obstructed?
A. Return to home position.
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is motor angle too high?
A. Return to normal operating position.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is carburetor clogged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Have ignition parts failed?
A. Have serviced by a Yamaha dealer.
Q. Is throttle valve adjustment incorrect?
A. Have serviced by a Yamaha dealer.
Q. Has alert system activated?
A. Find and correct cause of alert.
Q. Is battery cable disconnected?
A. Connect securely.
Q. Is spark plug gap incorrect?
A. Inspect and adjust as specified.
Alert buzzer sounds or indicator lights.
Q. Is cooling system clogged?
Q. Is ignition wiring damaged or poorly con- A. Check water intake for restriction.
nected?
A. Check wires for wear or breaks. Tighten Q. Is engine oil level low?
all loose connections. Replace worn or bro- A. Fill oil tank with specified engine oil.
ken wires.
Q. Is heat range of spark plug incorrect?
Q. Is specified engine oil not being used?
A. Check and replace oil as specified.
A. Inspect spark plug and replace it with rec-
ommended type.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Are carburetor adjustments incorrect?
A. Have serviced by a Yamaha dealer.
Q. Is engine oil contaminated or deteriorat-
ed?
A. Replace oil with fresh, specified type.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Is oil filter clogged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent screw on fuel tank closed?
A. Open air vent screw.
Q. Has oil feed/injection pump malfunc-
tioned?
Q. Is choke knob pulled out?
A. Have serviced by a Yamaha dealer.
72
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Trouble Recovery
on gear housing?
A. Remove foreign matter and clean lower
Q. Is load on boat improperly distributed?
A. Distribute load to place boat on an even unit.
plane.
Q. Is fuel system obstructed?
Q. Is water pump or thermostat faulty?
A. Have serviced by a Yamaha dealer.
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is there excess water in fuel filter cup?
A. Drain filter cup.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Engine power loss.
Q. Is propeller damaged?
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
A. Have propeller repaired or replaced.
Q. Is spark plug gap incorrect?
Q. Is propeller pitch or diameter incorrect?
A. Install correct propeller to operate out-
A. Inspect and adjust as specified.
board at its recommended speed (r/min) Q. Is ignition wiring damaged or poorly con-
range.
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
Q. Is trim angle incorrect?
A. Adjust trim angle to achieve most efficient ken wires.
operation.
Q. Have electrical parts failed?
Q. Is motor mounted at incorrect height on A. Have serviced by a Yamaha dealer.
transom?
A. Have motor adjusted to proper transom Q. Is specified fuel not being used?
height.
A. Replace fuel with specified type.
Q. Has alert system activated?
A. Find and correct cause of alert.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is boat bottom fouled with marine growth? Q. Is thermostat faulty or clogged?
A. Clean boat bottom. A. Have serviced by a Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect Q. Is air vent screw closed?
type?
A. Open the air vent screw.
A. Inspect spark plug(s). Clean or replace
with recommended type.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Are weeds or other foreign matter tangled
73
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Trouble Recovery
Q. Is fuel joint connection incorrect?
A. Connect correctly.
trailering. Damage could make the out-
board motor unsafe to operate.
If the outboard motor hits an object in the wa-
ter, follow the procedure below.
Q. Is heat range of spark plug incorrect?
A. Inspect spark plug and replace it with rec-
ommended type.
Q. Is high pressure fuel pump drive belt bro-
ken?
A. Have serviced by a Yamaha dealer.
Q. Is engine not responding properly to shift
lever position?
A. Have serviced by a Yamaha dealer.
1. Stop the engine immediately.
2. Inspect the control system and all com-
ponents for damage. Also inspect the
boat for damage.
Engine vibrates excessively.
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
3. Whether damage is found or not, return
to the nearest harbor slowly and careful-
ly.
Q. Is propeller shaft damaged?
A. Have serviced by a Yamaha dealer.
4. Have a Yamaha dealer inspect the out-
board motor before operating it again.
EMU29463
Q. Are weeds or other foreign matter tangled
on propeller?
A. Remove and clean propeller.
Replacing fuse
If the fuse has blown on an electric start
model, open the fuse holder and replace the
fuse with a new one of the proper amperage.
EWM00631
Q. Is motor mounting bolt loose?
A. Tighten bolt.
Q. Is steering pivot loose or damaged?
A. Tighten or have serviced by a Yamaha
dealer.
EMU29433
WARNING
Substituting an incorrect fuse or a piece
of wire could allow excessive current
flow. This could cause electric system
damage and a fire hazard.
Temporary action in
emergency
EMU29440
Impact damage
EWM00870
WARNING
The outboard motor can be seriously
damaged by a collision while operating or
74
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Trouble Recovery
EMU29533
Starter will not operate
If the starter mechanism does not operate
(the engine cannot be cranked with the start-
er), the engine can be started with an emer-
gency starter rope.
EWM01022
1
WARNING
2
● Use this procedure only in an emergen-
cy to return to the nearest port for re-
pairs.
● When the emergency starter rope is
used to start the engine, the start-in-
gear protection device does not oper-
ate. Make sure the remote control lever
is in neutral. Otherwise the boat could
unexpectedly start to move, which
could result in an accident.
● Attach the engine shut-off cord to a se-
cure place on your clothing, or your
arm or leg while operating the boat.
● Do not attach the cord to clothing that
could tear loose. Do not route the cord
where it could become entangled, pre-
venting it from functioning.
ZMU02561
1. Fuse holder
2. Fuse (20 A)
Consult your Yamaha dealer if the new fuse
immediately blows again.
EMU29512
Power trim and tilt will not operate
If the engine cannot be tilted up or down with
the power trim and tilt because of a dis-
charged battery or a failure with the power
trim and tilt unit , the engine can be tilted
manually.
1. Loosen the manual valve screw by turn-
ing it clockwise until it stops.
● Avoid accidentally pulling the cord dur-
ing normal operation. Loss of engine
power means the loss of most steering
control. Also, without engine power,
the boat could slow rapidly. This could
cause people and objects in the boat to
be thrown forward.
1
● Make sure no one is standing behind
you when pulling the starter rope. It
could whip behind you and injure
someone.
ZMU02562
1. Manual valve screw
● An unguarded, rotating flywheel is very
dangerous. Keep loose clothing and
other objects away when starting the
engine. Use the emergency starter rope
only as instructed. Do not touch the fly-
2. Put the engine in the desired position,
then tighten the manual valve screw by
turning it counterclockwise.
75
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Trouble Recovery
wheel or other moving parts when the
engine is running. Do not install the
starter mechanism or top cowling after
the engine is running.
● Do not touch the ignition coil, spark
plug wire, spark plug cap, or other elec-
trical components when starting or op-
erating the motor. You could get an
electrical shock.
ZMU03140
EMU29574
Emergency starting engine
1. Remove the top cowling.
2. Disconnect the start-in-gear protection
cable from the starter, if equipped.
3. Remove the starter/flywheel cover after
removing the bolt(s).
ON
OFF
ZMU02609
4. Prepare the engine for starting. For fur-
ther information, see page 43. Be sure
the engine is in neutral and that the clip
is attached to the engine shut-off switch.
The main switch must be “ ” (on), if
equipped.
ZMU03541
5. Insert the knotted end of the emergency
starter rope into the notch in the flywheel
rotor and wind the rope several turns
around the flywheel clockwise.
6. Pull the rope slowly until resistance is
felt.
7. Give a strong pull straight out to crank
and start the engine. Repeat if neces-
sary.
76
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Trouble Recovery
1
1
2
2
ZMU02614
ZMU03843
TIP:
1. CDI unit
2. Emergency connector
When the engine does not start with this pro-
cedure, see page 77.
EMU29671
EMU29706
Cold engine fails to start
If the engine fails to start when it is cold, use
Engine fails to operate
EMU29691
the following procedure.
EWM00410
Ignition system malfunction
If the battery voltage is low or in the unlikely
event of an ignition system malfunction, the
engine speed may become erratic or the en-
gine may stop. In such a situation, follow the
procedure below.
1. Remove the CDI unit cover or electrical
cover, if equipped.
2. Disconnect the yellow cord (emergency
WARNING
When starting or operating the engine, do
not touch the ignition coil, spark plug
wire, spark plug cap, or other electrical
parts carrying high voltage. Keep loose
clothing and other objects away from the
engine when starting it. Do not touch the
flywheel or other moving parts when the
engine is running.
circuit) of the CDI unit to return to port.
EWM00350
WARNING
1. Adjust the trim angle so that the drive
shaft is at right angles to the water sur-
face or is trimmed in.
2. On models equipped with an emergency
starter valve, open it. The valve is locat-
ed behind the silencer cover on the front
of the engine.
When the yellow cord is disconnected,
the idle and low speeds are slightly high-
er than normal. Use care when starting off
or stopping.
ECM00380
NOTICE
Follow this procedure only in an emer-
gency and just long enough to return to
port for repairs.
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Trouble Recovery
OPEN
CLOSE
ZMU03844
5. Turn the main switch to “ ” (on).
3. Squeeze the primer pump two or three
times to feed fuel.
OFF ON START
ZMU03144
ZMU03142
6. Turn the main switch to “
NOTICE: Never turn the main switch
to “ ” (start) while the engine is
” (start).
4. Open the throttle slightly without shifting
using the throttle grip, neutral throttle le-
ver or free accelerator. It is necessary to
change the throttle opening slightly de-
pending on the engine temperature. Af-
ter the engine starts, return the throttle to
its original position.
running. Do not keep the starter mo-
tor turning for more than 5 seconds. If
the starter motor is turned continu-
ously for more than 5 seconds, the
battery will be quickly discharged,
thus making it impossible to start the
engine. The starter can also be dam-
aged. If the engine will not start after
5 seconds of cranking, return the
main switch to “ ” (on), wait 10 sec-
onds, then crank the engine again.
[ECM00192]
N
ZMU03143
78
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Trouble Recovery
ON
START
ZMU03922
7. After the engine starts, close the emer-
gency starter valve (if used), then return
the throttle to its original position.
OPEN
CLOSE
ZMU03145
TIP:
When the starter mechanism malfunctions,
see page 75.
EMU33501
Treatment of submerged motor
If the outboard motor is submerged, immedi-
ately take it to a Yamaha dealer. Otherwise
some corrosion may begin almost immedi-
ately. NOTICE: Do not attempt to run the
outboard motor until it has been com-
pletely inspected.
[ECM00401]
79
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Consumer information
EMU29811
Important warranty information for U.S.A. and Canada
80
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Consumer information
81
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Consumer information
EMU29820
YAMAHA MOTOR CORPORATION, U.S.A.
OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY
82
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Consumer information
83
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Consumer information
84
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Consumer information
EMU29841
IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR
YAMAHA OUTSIDE THE USA OR CANADA
85
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Printed in Japan
April 2008–0.3 × 1 !
Printed on recycled paper
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