9.9
15
OWNER’S MANUAL
Read this manual carefully before operating this
outboard motor.
U.S.A.Edition
LIT-18626-08-34
63V-28199-1E
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ZMU01690
Read this manual carefully before operating this outboard motor. Keep this
manual onboard in a waterproof bag when boating. This manual should stay
with the outboard motor if it is sold.
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Important manual information
EMU31283
your machine and this manual. If there is any
question concerning this manual, please con-
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 obtain
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.
sult your Yamaha dealer.
TIP:
The 9.9MH, 15MH and the standard accesso-
ries are used as a base for the explanations
and illustrations in this manual. Therefore
some items may not apply to every model.
EMU25111
9.9, 15
OWNER’S MANUAL
©2009 by Yamaha Motor Corporation,
USA
In this Owner’s Manual particularly important
information is distinguished in the following
ways.
1st edition, February 2009
All rights reserved.
: This is the safety alert symbol. It is used
to alert you to potential personal injury haz-
ards. Obey all safety messages that follow
this symbol to avoid possible injury or death.
EWM00781
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, USA
is expressly prohibited.
Printed in Japan
WARNING
P/N LIT-18626-08-34
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 product
information available at the time of printing,
there may be minor discrepancies between
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Table of contents
Outboard motor safety .................... 1
Hot parts............................................. 1
Electric shock ..................................... 1
Gasoline ............................................. 1
Modifications ...................................... 2
Boating safety ................................. 2
Alcohol and drugs............................... 2
People in the water............................. 2
Passengers ........................................ 2
Avoid collisions................................... 2
Weather.............................................. 3
Boating safety publications................. 3
Boating organizations...................... 4
Basic boating rules
Steering and sailing rules and sound
signals............................................. 4
General information ..........................8
Identification numbers record.......... 8
Outboard motor serial number ........... 8
Read manuals and labels................ 9
Warning labels.................................... 9
Specifications and
Emission control information......... 16
Fuel tank........................................... 17
Throttle grip ...................................... 18
Engine shut-off cord (lanyard)
Manual starter handle....................... 20
Steering friction adjuster................... 20
Trim rod (tilt pin) ............................... 21
Tilt lock mechanism.......................... 21
Tilt support bar ................................. 21
Cowling lock lever(s) (turn type)....... 22
Carrying handle................................ 22
Installation....................................... 23
Installation..................................... 23
Mounting the outboard motor ........... 23
Clamping the outboard motor........... 24
requirements....................................12
Specifications................................ 12
Installation requirements............... 13
Boat horsepower rating .................... 13
Mounting motor ................................ 13
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Breaking in engine............................ 26
Checks before starting engine ...... 26
Engine .............................................. 28
Filling fuel and engine oil............... 28
Operating engine........................... 30
Starting engine ................................. 31
Checks after starting engine ......... 33
Cooling water ................................... 33
Shifting ............................................. 33
Stop switches ................................... 34
Shifting .......................................... 34
Stopping boat................................ 35
Stopping engine ............................ 35
Procedure......................................... 35
Trimming outboard motor.............. 35
Adjusting trim angle for manual tilt
Installing propeller ............................ 50
Cleaning fuel tank............................. 52
Trouble Recovery............................ 54
Troubleshooting ............................ 54
Impact damage................................. 57
Starter will not operate ..................... 57
Emergency starting engine............... 58
models .......................................... 36
Adjusting boat trim............................ 36
Tilting up and down....................... 37
Procedure for tilting up
(manual tilt models)....................... 38
Procedure for tilting down
(manual tilt models)....................... 38
Shallow water................................ 39
Cruising in shallow water
(manual tilt models)....................... 39
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Table of contents
Treatment of submerged motor..... 59
Consumer information....................60
YAMAHA MOTOR
CORPORATION, U.S.A.
OUTBOARD MOTOR
TWO YEAR LIMITED
WARRANTY............................... 60
IMPORTANT WARRANTY
INFORMATION IF YOU USE
YOUR YAMAHA OUTSIDE
THE USA OR CANADA ............. 63
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Safety information
EMU33622Outboard motor safety
running away under power and leaving peo-
ple stranded, or running over people or ob-
jects.
Observe these precautions at all times.
EPMrUo36p501eller
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 become en-
tangled, preventing it from functioning.
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-
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 neu-
tral, and sharp edges of the propeller can cut
even when stationary.
G Stop the engine when a person is in the wa-
ter near you.
G Keep people out of reach of the propeller,
even when the engine is off.
ERMoU3t3a630ting parts
Hands, feet, hair, jewelry, clothing, PFD
straps, etc. can become entangled with inter-
nal rotating parts of the engine, resulting in se-
rious injury or death.
Keep the top cowling in place whenever pos-
sible. Do not remove or replace the cowling
with the engine running.
jects forward.
EMU33810
Gasoline
Gasoline and its vapors are highly flam-
mable and explosive. Always, refuel accord-
ing to the procedure on page 30 to reduce the
risk of fire and explosion.
EMU33820
Only operate the engine with the cowling re-
moved according to the specific instructions in
the manual. Keep hands, feet, hair, jewelry,
clothing, PFD straps, etc. away from any ex-
posed moving parts.
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.
If you swallow gasoline, inhale a lot of gaso-
line vapor, or get gasoline in your eyes, get
immediate medical attention. Never siphon
fuel by mouth.
ECMaU3r3b900on monoxide
This product emits exhaust gases which con-
tain carbon monoxide, a colorless, odorless
gas which may cause brain damage or death
when inhaled. Symptoms include nausea,
dizziness, and drowsiness. Keep cockpit and
cabin areas well ventilated. Avoid blocking ex-
haust outlets.
EHMoU3t364p0arts
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.
EEMlUe33c65t0ric shock
Do not touch any electrical parts while starting
or operating the engine. They can cause
shock or electrocution.
EEMnU3g36i7n1 e shut-off cord (lanyard)
Attach the engine shut-off cord so that the en-
gine stops if the operator falls overboard or
leaves the helm. This prevents the boat from
1
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Safety information
EMU33780
and when operating above an idle speed.
Standing or sitting in non-designated loca-
tions may result in being thrown either over-
board or within the boat due to waves, wakes,
or sudden changes in speed or direction.
Even when people are positioned properly,
alert your passengers if you must make any
unusual maneuver. Always avoid jumping
Modifications
Do not attempt to modify this outboard motor.
Modifications to your outboard motor may re-
duce safety and reliability, and render the out-
board unsafe or illegal to use.
EMU33740
Boating safety
This section includes a few of the many im-
portant safety precautions that you should fol-
low when boating.
EAMlUc33o71h0 ol and drugs
Never operate after drinking alcohol or taking
drugs. Intoxication is one of the most common
factors contributing to boating fatalities.
EPMeU3r3s72o0 nal flotation devices
Have an approved personal flotation device
(PFD) on board for every occupant. Yamaha
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 boating condi-
tions.
waves or wakes.
EMU33760
Overloading
Do not overload the boat. Consult the boat ca-
pacity plate or boat manufacturer for maxi-
mum 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-
dling and lead to an accident, capsizing or
swamping.
EAMvU3o37i7d2 collisions
Scan constantly for people, objects, and other
boats. Be alert for conditions that limit your
visibility or block your vision of others.
EPMeU3o37p31le in the water
Always watch carefully for people in the wa-
ter, such as swimmers, skiers, or divers,
whenever the engine is running. When some-
one is in the water near the boat, shift into
neutral and stop the engine.
Stay away from swimming areas. Swimmers
can be hard to see.
ZMU06025
The propeller can keep moving even when
the motor is in neutral. Stop the engine when
a person is in the water near you.
EPMaU3s37s51engers
Operate defensively at safe speeds and keep
a safe distance away from people, objects,
and other boats.
Consult your boat manufacturer’s instructions
for details about appropriate passenger loca-
tions in your boat and be sure all passengers
are positioned properly before accelerating
G Do not follow directly behind other boats or
waterskiers.
2
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Safety information
G Avoid sharp turns or other maneuvers that You may also want to consider an Internet-
make it hard for others to avoid you or un- based program for basic boater education.
derstand where you are going.
G Avoid areas with submerged objects or by the BoatU.S. Foundation, is approved by
shallow water. the National Association of State Boating Law
The Online Boating Safety Course provided
G Ride within your limits and avoid aggressive Administrators (NASBLA) and recognized by
maneuvers to reduce the risk of loss of con- the United States Coast Guard. Most, but not
trol, ejection, and collision.
all, states accept this course to meet their
G Take early action to avoid collisions. Re- minimum requirements. While it cannot re-
member, boats do not have brakes, and place an in-depth course such as one offered
stopping the engine or reducing throttle can by the U.S. Coast Guard, U.S. Power Squad-
reduce the ability to steer. If you are not ron, or other organization, this online course
sure that you can stop in time before hitting does provide a general overview of the basics
an obstacle, apply throttle and turn in anoth- in boating safety, requirements, navigation,
er direction.
and operation. Upon successful completion of
the course, the user can download a certifi-
cate of completion immediately or, for a small
charge, request one by mail. To take this free
course, go to boatus.org.
EPMaU3s38s80enger training
Make sure at least one other passenger is
trained to operate the boat in the event of an
emergency.
EMU33790
Weather
Stay informed about the weather. Check
weather forecasts before boating. Avoid boat-
ing in hazardous weather.
EAMcU3c38i0d0 ent reporting
Boat operators are required by law to file a
Boating Accident Report with their state boat-
ing law enforcement agency if their boat is in-
volved in any of the following accidents:
EBMoU3a38t90ing safety publications
1. There is loss of life or probable loss of life. Be informed about boating safety. Additional
2. There is personal injury that requires publications and information can be obtained
medical attention beyond first aid.
3. There is property damage to boats or oth-
er property over a certain amount.
4. There is complete loss of a boat.
Contact local law enforcement personnel if a
report is necessary.
from many boating organizations.
EMU33590
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
EBMoU3a38t70education and training
Operators should take a boating safety presented in the following section are con-
course. This may be required in your state. densed- and have been provided for your
Many of the organizations listed in the next convenience only.
section can provide information about cours-
es in your area.
3
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Safety information
Association of State Boating Law Administra-
tors, or your local Power Squadron for a com- Marine Retailers Association of America
plete set of rules governing the waters in 155 N. Michigan Ave. Chicago,
which you will be using your boat.
IL 60304
EMU33681 Boating organizations
The following organizations provide boating
safety training and information about boating EMBU33a690sic boating rules (Rules of
safety and laws.
the road)
Just as there are rules that apply when you
United States Coast Guard
Consumer Affairs Staff (G-BC)
Office of Boating, Public, and Consumer Af-
fairs
U.S. Coast Guard Headquarters
Washington, D.C. 20593-0001
Boating Safety Hotline: 1-800-368-5647
are driving on streets and highways, there are
waterway rules that apply when you are driv-
ing your boat. These rules are used interna-
tionally. (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 encoun-
ter another vessel on the water.
ESMtUe33e70r0ing 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.
United States Power Squadrons
1-888-FOR-USPS (1-888-367-8777)
Boat Owners Association of The United
States
1-800-336-BOAT (1-800-336-2628)
National Association of State Boating Law
Administrators (NASBLA)
1500 Leestown Road, Suite 330
Lexington, KY 40511 859-225-9497
Stand-on vessel
The vessel with the right-of-way has the duty
to continue its course and speed, except to
avoid an immediate collision. When you main-
tain your direction and speed, the other vessel
will be able to determine how best to avoid
you.
National Marine Manufacturers Associa-
tion (NMMA)
200 East Randolph Drive
Suite 5100
Chicago, IL 60601
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
4
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Safety information
vessel. Normally, you should not cross in front
of the vessel with the right-of-way. You should
slow down or change directions briefly and
pass behind the other vessel. You should al-
ways 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,
“ 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
vessels try to avoid each other. If that is the
case, both vessels become “ Give-Way ” ves-
sels.
Meeting
If you are meeting another power vessel head
on, and are close enough to run the risk of col-
lision, neither of you has the right-of-way Both
of you should alter course to avoid an acci-
dent. You should keep the other vessel on
your port (left) side. This rule doesn’t apply if
both of you will clear one another if you con-
tinue on your set course and speed.
ERMuU2l5e52s1 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 fol-
lowed:
Meeting: (you are approaching another ves-
sel head-on)
Crossing: (you are traveling across the other
vessel’s path)
Overtaking: (you are passing or being
passed by another vessel)
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 other 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 direction, provid-
ed the other vessel gives you the right-of-way
as it should.
In the following illustration, your boat is in the
center. You should give the right-of-way to
any vessels shown in white area (you are the
Give-Way vessel). Any vessels in the shaded
area must yield to you (they are the Give-Way
vessels). Both you and the meeting vessel
must alter course to avoid each other.
5
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Safety information
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 re-
gardless of position. Fishing vessels cannot,
however, impede the passage of other ves-
sels 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-driven
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.
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, num-
bers and lights to show which side of the buoy
a boater should pass on when navigating in a
particular direction. The markings on these
buoys are oriented from the perspective of be-
ing entered from seaward (the boater is going
towards the port). This means that red buoys
are passed on the starboard (right) side when
proceeding from open water into port, and
black buoys are to port (left) side. When navi-
gating out of port, your position with respect to
the buoys should be reversed; red buoys
should be to port and black buoys to star-
board.
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 another vessel is
passing you, you should maintain your speed
and direction so that the other vessel can
steer itself around you.
EMU25531
Other special situations
There are three other rules you should be
aware of when driving your boat around other
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 water
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 nav-
igate such waters with your boat, you will
need to carry a portable air horn, available
from local marine supply stores.
6
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Safety information
Many bodies of water used by boaters are en- white with black letters and orange boarders.
tirely within the boundaries of a particular They signify speed zones, restricted areas,
state. The Uniform State Waterway Marking danger areas, and general information.
System has been devised for these waters. Remember, markings may vary by geograph-
This system uses buoys and signs with dis- ic location. Always consult local boating au-
tinctive shapes and colors to show regulatory thorities before driving your boat in unfamiliar
or advisory information. These markers are waters.
ZMU01708
7
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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. Outboard motor serial number location
8
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General information
EMU33520
Read manuals and labels
Before operating or working on this motor:
G Read this manual.
G Read any manuals supplied with the boat.
G 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.
9.9, 15
1
2
3
ZMU06037
9
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General information
1
2
3
ZMU05697
EMU33843
Read Owner’s Manual
Symbols
The following symbols mean as follows.
Notice/Warning
ZMU05664
ZMU05696
10
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General information
Hazard caused by continuous rotation
Engine start/ Engine cranking
ZMU05665
ZMU05668
Electrical hazard
ZMU05666
Remote control lever/gear shift lever operat-
ing direction, dual direction
ZMU05667
11
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Specifications and requirements
EMU31480
Spark plug (NGK):
B7HS-10
Specifications
TIP:
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
Control system:
“(AL)” stated in the specification data below
represents the numerical value for the alumi-
num propeller installed.
Tiller
Likewise, “(SUS)” represents the value for
stainless steel propeller installed and “(PL)”
Starting system:
Manual
for plastic propeller installed.
EMU2821E
Starting carburetion system:
Choke valve
Alternator output:
80 W
Drive unit:
Gear positions:
Forward-neutral-reverse
Gear ratio:
2.08 (27/13)
Trim and tilt system:
Manual tilt
Propeller mark:
J
Dimension:
Overall length:
873 mm (34.4 in)
Overall width:
332 mm (13.1 in)
Overall height S:
1040 mm (40.9 in)
Transom height S:
440 mm (17.3 in)
Weight (AL) S:
36.0 kg (79 lb)
Performance:
Fuel and oil:
Recommended fuel:
Regular unleaded gasoline
Min. pump octane:
86
Fuel tank capacity:
24.0 L (6.34, US gal, 5.28 Imp.gal)
Recommended engine oil:
YAMALUBE 2-stroke outboard motor oil
Fuel:oil ratio:
Regular gasoline:
100 :1
Lubrication:
Pre-mixed fuel and oil
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
0.250 L (0.264 US qt, 0.220 Imp.qt)
Full throttle operating range:
4500–5500 r/min
Maximum output:
15MH 11.0 kW@5000 r/min (15
HP@5000 r/min)
9.9MH 7.3 kW@5000 r/min (9.9
HP@5000 r/min)
Idling speed (in neutral):
750 50 r/min
Engine:
Type:
2-stroke L
Displacement:
246.0 cm³
Bore × stroke:
56.0 × 50.0 mm (2.20 × 1.97 in)
Ignition system:
CDI
12
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Specifications and requirements
EMU25694
Tightening torque for engine:
Battery requirements
Spark plug:
EMU25730
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
Propeller nut:
17.0 Nm (1.73 kgf-m, 12.5 ft-lb)
EMU33554
Without a rectifier or Rectifier Regula-
tor
ECM01090
NOTICE
Installation requirements
A battery cannot be connected to models
that do not have a rectifier or Rectifier
Regulator.
EBMoU3a35t63horsepower rating
EWM01560
WARNING
Overpowering a boat can cause severe in-
stability.
If you wish to use a battery with the models
without a rectifier or Rectifier Regulator, install
an optional Rectifier Regulator.
Before installing the outboard motor(s), con-
firm that the total horsepower of your motor(s)
does not exceed the boats maximum horse-
power rating. See the boat’s capacity plate or
Using a maintenance-free battery with the
above models can shorten the life of the bat-
tery significantly.
Install an optional Rectifier Regulator or use
accessories rated to withstand 18 volts or
higher with the above models. Consult your
Yamaha dealer for details on installing an op-
contact the manufacturer.
EMU33571
Mounting motor
EWM01570
tional Rectifier Regulator.
EMU34192
WARNING
G Improper mounting of the outboard mo-
such as poor handling, loss of control,
or fire hazards.
G Because the motor is very heavy, spe-
cial equipment and training is required
to mount it safely.
Propeller selection
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 propellers for ev-
ery Yamaha outboard motor and every appli-
cation.
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
23.
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 appropri-
ate.
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-
13
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Specifications and requirements
EMU36360
load. Generally, chose a larger pitch propeller
Fuel requirements
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.
EMU36781
Gasoline
Use a good quality gasoline that meets the
minimum octane rating. If knocking or pinging
occurs, use a different brand of gasoline or
premium unleaded fuel. Yamaha recomends
that you use alcohol-free (see Gasohol) gas-
oline whenever possible.
For instructions on propeller removal and in-
stallation, see page 49.
Recommended gasoline:
Regular unleaded gasoline with a mini-
mum Octane rating of 86 (Pump Oc-
tane Number) = (R+M)/2
ECM01981
x
-
NOTICE
1
2 3
G Do not use leaded gasoline. Leaded gas-
oline can seriously damage the engine.
G Avoid getting water and contaminants in
the fuel tank. Contaminated fuel can
cause poor performance or engine dam-
age. Use only fresh gasoline that has
been stored in clean containers.
ZMU04606
1. Propeller diameter in inches
2. Propeller pitch in inches
3. Type of propeller (propeller mark)
Gasohol
EMU25770
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 engine
starting and running problems. Yamaha does
not recommend gasohol containing methanol
because it can cause fuel system damage or
engine performance problems.
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 before
starting the engine.
EMU2565E1 ngine oil requirements
Recommended engine oil:
YAMALUBE 2-stroke outboard motor
oil
If the recommended engine oil is not avail-
able, another 2-stroke engine oil with an
NMMA-certified TC-W3 rating may be used.
It is recommended that you install a water-
separating marine fuel filter assembly (10 mi-
cron minimum) between your boat’s fuel tank
and outboard motor when using ethanol. Eth-
14
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Specifications and requirements
anol is known to allow moisture to be ab- tor in muddy or acidic water conditions.
sorbed into boat fuel tanks and systems. However, depending on the model it might not
Moisture in the fuel can cause corrosion of be required.
EMU36330
metallic fuel system components, starting and
Anti-fouling paint
running complaints and require additional fuel
A clean hull improves boat performance. The
system maintenance.
ERMiUn27g270Free Fuel Additive
boat bottom should be kept as clean of marine
growth as possible. If necessary, the boat bot-
Gasoline is a precise blend of many different
substances, each chosen to give certain char-
acteristics. Gasoline blends have been
changing in recent years in response to con-
cerns about pollution and resulting emissions
regulations. One of the most obvious changes
has been the elimination of lead from most fu-
els.
tom can be coated with an anti-fouling paint
approved for your area to inhibit marine
growth.
Do not use anti-fouling paint which includes
copper or graphite. These paints can cause
more rapid engine corrosion.
As gasoline has changed, the amount of addi-
tives such as aromatics and oxygenates has
increased. These additives are important for
the engines in passenger cars, but they can
have detrimental effects in marine engines,
because of increased deposits in the combus-
tion chamber. When enough deposits collect,
piston rings begin sticking. Performance
drops and engine wear increases dramatical-
ly.
While many additives available may reduce
deposits, Yamaha recommends the use of
Ring Free Fuel Additive, available from your
Yamaha dealer. Ring Free Fuel Additive
has repeatedly proven its ability to clean com-
bustion deposits from inside the engine, nota-
bly the critical piston-ring-land area, and fuel
system components. Follow product labeling
for use instructions.
EMMU363o41tor disposal requirements
Never illegally discard (dump) the motor.
Yamaha recommends consulting the dealer
about discarding the motor.
EMU36351Emergency equipment
Keep the following items onboard in case
there is trouble with the motor.
G A tool kit with assorted screwdrivers, pliers,
wrenches (including metric sizes), and
electrical tape.
G Waterproof flashlight with extra batteries.
G An extra engine shut-off cord (lanyard) with
clip.
G Spare parts, such as an extra set of spark
plugs.
EMU36880 Muddy or acidic water
Yamaha strongly recommends that you have
your dealer install the optional chromium-plat-
ed water pump kit if you use the outboard mo-
Consult your Yamaha dealer for details.
15
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Specifications and requirements
EMEU25m221ission control information
ENMoU2r52t3h0 American models
This engine conforms to U.S. Environmental
Protection Agency (EPA) regulations for ma-
rine SI engines. See the label affixed to your
engine for details.
EMU30390
Approval label of emission control certifi-
cate
This label is attached to the bottom cowling.
1. Manufactured date label location
Existing Technology; N/A
1
Manufactured:
ZMU04346
ZMU06058
1. Approval label location
EMU25262
Manufactured date label
This label is attached to the clamp bracket or
the swivel bracket.
16
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Components
EMU2579M
Components diagram
TIP:
* May not be exactly as shown; also may not be included as standard equipment on all models.
9.9, 15
1. Top cowling
17.Cooling water inlet
18.Propeller*
19.Fuel hose
2. Cowling lock lever
3. Cooling water pilot hole
4. Tilt lock lever
EMU25802
5. Manual starter handle
6. Gear shift lever
Fuel tank
If your model was equipped with a portable
7. Engine stop button/Engine shut-off switch
8. Tiller handle
fuel tank, its function is as follows.
EWM00020
9. Throttle friction adjuster
10.Clamp screw
11.Carrying handle
12.Choke knob
13.Restraint cable attachment
14.Clamp bracket
WARNING
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.
15.Trim rod
16.Anti-cavitation plate
17
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Components
2
1
4
3
ZMU02284
1. Fuel joint
EMU25922
Gear shift lever
2. Fuel gauge
3. Fuel tank cap
4. Air vent screw
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.
EMU25830
Fuel joint
This joint is used to connect the fuel line.
EMU25841
Fuel gauge
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.
EAMiUr25v86e0 nt screw
1. Forward “ ”
2. Neutral “ ”
3. Reverse “ ”
This screw is on the fuel tank cap. To loosen
the screw, turn it counterclockwise.
EMU25911
EMU25941
Throttle grip
Tiller handle
The throttle grip is on the tiller handle. Turn
the grip counterclockwise to increase speed
and clockwise to decrease speed.
To change direction, move the tiller handle to
the left or right as necessary.
18
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Components
EMU25961
When constant speed is desired, tighten the
adjuster to maintain the desired throttle set-
ting.
EEMnU2g59i9n3 e shut-off cord (lanyard) and
clip
Throttle indicator
The fuel consumption curve on the throttle in-
dicator shows the relative amount of fuel con-
sumed for each throttle position. Choose the
setting that offers the best performance and
fuel economy for the desired operation.
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 entangled,
preventing it from functioning. Avoid acci-
dentally pulling the cord during 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 ob-
jects in the boat to be thrown forward.
[EWM00122]
1. Throttle indicator
EMU25975
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. To decrease resistance, turn the
adjuster counterclockwise. 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, which could result in an
accident.
[EWM00032]
19
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Components
1. Cord
1. Use to start a hot engine
2. Clip
3. Engine shut-off switch
2. Use to warm up a cold engine or restart a
warm engine
3. Use to warm up a cold engine or restart a
warm engine
4. Use to start a cold engine
EEMnU2g60i0n1 e stop button
To open the ignition circuit and stop the en-
EMU26070
gine, push this button.
Manual starter handle
To start the engine, first gently pull the handle
out until resistance is felt. From that position,
then pull the handle straight out quickly to
crank the engine.
ECMhU2o603k0e knob
To supply the engine with the rich fuel mixture
required to start, pull out this knob. The choke
knob has the 4 operating positions shown in
the following illustration.
ESMtUe26e12r2ing friction adjuster
A friction device provides adjustable resis-
tance to the steering mechanism, and can be
set according to operator preference. An ad-
justing screw or bolt is located on the swivel
bracket.
20
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Components
1. Tilt lock lever
To increase resistance, turn the adjuster
clockwise.
To decrease resistance, turn the adjuster
counterclockwise.
EWM00040
To tilt the outboard motor up, set the tilt lock
lever to the “ ” (up) position. To tilt the out-
board motor down, set the tilt lock lever to the
” (down) position.
EMU26332
“
WARNING
Tilt support bar
The tilt support bar keeps the outboard motor
in the tilted up position.
Do not overtighten the friction adjuster. If
there is too much resistance, it could be
difficult to steer, which could result in an
accident.
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.
ECM01660
NOTICE
Do not use the tilt support bar when traile-
ring the boat. The outboard motor could
shake loose from the tilt support and fall.
If the motor cannot be trailered in the nor-
mal running position, use an additional
support device to secure it in the tilt posi-
tion.
EMU30440
Tilt lock mechanism
The tilt lock mechanism is used to prevent the
outboard motor from lifting out of the water
when in reverse gear.
21
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Components
ECMoU2w637l3ing lock lever(s) (turn type)
To remove the engine top cowling, turn the
cowling lock lever(s) and lift off the cowling.
When installing the cowling, check to be sure
it fits properly in the rubber seal. Then lock the
cowling again by returning the cowling lock le-
ver(s) to the lock position.
1. Carrying handle
2. Clamp bracket bar
1. Cowling lock lever(s)
ECMaU2r6r43y0 ing handle
A carrying handle is included on the clamp
bracket. After setting the handle up, it enables
you to carry the outboard motor easily with
one hand.
To set up the carrying handle, proceed as fol-
lows:
1. Place the tilt lock lever in the lock posi-
tion.
2. Securely hook the arm on the carrying
handle end to the clamp bracket bar.
ECM00080
NOTICE
Place the tilt lock lever in the lock position
while using the carrying handle. Other-
wise, the lower unit could fall to the
ground while carrying the motor.
22
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Installation
EMU26902
Installation
The information presented in this section is in-
tended as reference only. It is not possible to
provide complete instructions for every possi-
ble boat and motor combination. Proper
mounting depends in part on experience and
the specific boat and motor combination.
EWM01590
1
WARNING
ZMU01760
G Overpowering a boat could cause se-
vere instability. Do not install an out-
board motor with more horsepower than
the maximum rating on the capacity
plate of the boat. If the boat does not
have a capacity plate, consult the boat
manufacturer.
G Improper mounting of the outboard mo-
tor could result in hazardous conditions
such as poor handling, loss of control,
or fire hazards. For permanently mount-
ed models, your dealer or other person
experienced in proper rigging should
mount the motor.
1. Center line (keel line)
EMU26923
Mounting height
To run your boat at optimum efficiency, the
water resistance (drag) of the boat and out-
board motor must be made as little as possi-
ble. The mounting height of the outboard
motor greatly affects the water resistance. If
the mounting height is too high, cavitation
tends to occur, thus reducing the propulsion;
and if the propeller tips cut the air, the engine
speed will rise abnormally and cause the en-
gine to overheat. If the mounting height is too
low, the water resistance will increase and
thereby reduce engine efficiency. Mount the
outboard motor so that the anti-cavitation
plate is between the bottom of the boat and a
level 25 mm (1 in) below it.
EMU26911
Mounting the outboard motor
EWM01720
WARNING
Your dealer or other person experienced
in proper outboard motor mounting
should show you how to mount your out-
board motor.
The outboard motor should be mounted so
that the boat is well balanced. Otherwise, the
boat could be hard to steer. For single-engine
boats, mount the outboard motor on the cen-
terline (keel line) of the boat.
0–25mm
(0–1in)
ZMU02011
23
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Installation
ECM01631
allow the outboard motor to fall off or
move on the transom. This could
cause loss of control and serious inju-
ry. Make sure the transom screws are
tightened securely. Occasionally
check the screws for tightness during
NOTICE
G Check that the idle hole stays high
enough to keep out water getting inside
engine even if the boat is in stationary
with maximum load.
G 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 air-
borne water spray while the boat is
cruising. If the motor is operated contin-
uously in the presence of airborne water
spray, enough water could enter the en-
gine through the intake opening on the
cowling to cause severe engine dam-
age. Eliminate the cause of the airborne
water spray.
operation.
[EWM00641]
ZMU02012
2. If the restraint cable attachment is
equipped on your engine, a restraint ca-
ble or chain should be used. Attach one
end to the restraint cable attachment and
the other to a secure mounting point on
the boat. Otherwise the engine could be
completely lost if it accidentally falls off
the transom.
TIP:
G The optimum mounting height of the out-
board motor is affected by the boat and mo-
tor combination and the desired use. Test
runs at different heights can help determine
the optimum mounting height. Consult your
Yamaha dealer or boat manufacturer for
further information on determining the prop-
er mounting height.
G For instructions on setting the trim angle of
the outboard motor, see page 35.
ECMlUa26m972ping the outboard motor
1. Place the outboard motor on the transom
so that it is positioned as close to the cen-
ter as possible. Tighten the transom
clamp screws evenly and securely. Oc-
casionally check the clamp screws for
tightness during operation of the out-
board motor because they could become
loose due to engine vibration.
WARNING! Loose clamp screws could
ZMU02013
3. Secure the clamp bracket to the transom
using the bolts provided with the out-
board (if packed). For details, consult
your Yamaha dealer. WARNING! Avoid
using bolts, nuts or washers other
than those contained in the engine
24
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Installation
packaging. If used, they must be of at
least the same quality of material and
strength and must be tightened se-
curely. After tightening, test run the
engine and check their tightness.
[EWM00651]
25
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Operation
EMU36381
3. Next two hours:
First-time operation
Accelerate at full throttle onto plane, then
reduce engine speed to three-quarter
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.
4. Remaining seven hours:
EBMrU3e0a17k4 ing in engine
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. NOTICE: Failure to follow the break-in
procedure could result in reduced engine
Run the engine at any speed. However,
avoid operating at full throttle for more
than 5 minutes at a time.
life or even severe engine damage.
[ECM00801]
EMU27050
Gasoline and engine oil mixing chart
(25:1)
5. After the first 10 hours:
Operate the engine normally. Use the
standard premix ratio of gasoline and oil.
For details on mixing fuel and oil, see
page 28.
EMU36400
Getting to know your boat
Different boats handle differently. Operate
cautiously while you learn how your boat han-
dles under different conditions and with differ-
1.
: Gasoline
2. : Engine oil
ent trim angles (see page 35).
EMU36412
ECM00150
NOTICE
Checks before starting engine
EWM01920
Be sure to mix gasoline and oil complete-
ly, otherwise the engine may be damaged.
WARNING
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 accident
could occur.
EMU27074
Procedure for pre-mixed models
Run the engine under load (in gear with a pro-
peller installed) for 10 hours as follows.
1. First 10 minutes:
Run the engine at the lowest possible
speed. A fast idle in neutral is best.
2. Next 50 minutes:
ECM00120
NOTICE
Do not start the engine out of water. Over-
heating and serious engine damage can
occur.
Do not exceed half throttle (approximate-
ly 3000 r/min). Vary engine speed occa-
sionally. If you have an easy-planing
boat, accelerate at full throttle onto plane,
then immediately reduce the throttle to
3000 r/min or less.
EMU37141
Fuel level
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
26
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Operation
EMU37320
an emergency reserve. With the boat level on
a trailer or in the water, check the fuel level.
For fuel filling instructions, see page 28.
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.
ERMeU3m657o0 ve cowling
For the following checks, remove the top
cowling from the engine. To remove the en-
gine top cowling, release the lock lever and lift
off the cowling.
ECMoU3n689t1rols
ZMU06092
G Move the tiller handle fully to the left and
right to make sure operation is smooth.
G 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.
G Look for loose or damaged connections of
the throttle and shift cables.
EEMnU3g64i8n1 e shut-off cord (lanyard)
Inspect the engine shut-off cord for damage,
such as cuts, breaks, and wear.
EMU36442
Fuel system
EWM00060
WARNING
Gasoline and its vapors are highly flam-
mable and explosive. Keep away from
sparks, cigarettes, flames, or other sourc-
es of ignition.
EWM00910
WARNING
Leaking fuel can result in fire or explosion.
G Check for fuel leakage regularly.
G If any fuel leakage is found, the fuel sys-
tem must be repaired by a qualified me-
chanic. Improper repairs can make the
outboard unsafe to operate.
EMU36451
Check for fuel leaks
G Check for fuel leaks or gasoline fumes in
the boat.
G Check for fuel leakage from the fuel system.
G Check the fuel tank and fuel lines for
cracks, swellings, or other damages.
1. Cord
2. Clip
27
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Operation
3. Engine shut-off switch
EMU27120
Oil
G Check to be sure you have plenty of oil for
your trip.
EEMnU2g71i4n1 e
G Check the engine and engine mounting.
G Look for loose or damaged fasteners.
G Check the propeller for damage.
EInMUs36t9a53ll cowling
EMU27234
Filling fuel and engine oil
1. Be sure that a cowling lock lever is re-
EMU27247
leased.
Filling fuel for portable tank
2. Be sure that the rubber seal is seated all
the way around the top cowling.
EWM01830
WARNING
3. Place the top cowling on bottom cowling.
4. Check to be sure the rubber seal fits cor-
rectly all the way around the engine.
5. Move the lever 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
G 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.
G Gasoline is poisonous and can cause in-
jury 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 gas-
oline in your eyes, see your doctor im-
mediately. If gasoline spills on your
skin, wash with soap and water. If gaso-
line spills on your clothing, change your
clothes.
speeds.
[ECM01990]
1. Be sure the engine is stopped.
2. Disconnect the fuel line from the fuel tank
and tighten the air vent screw on the fuel
tank cap.
ZMU06117
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.
28
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Operation
ZMU02834
ZMU06621
9. Tighten the filler cap securely.
10. Wipe up any spilled gasoline immediately
with dry rags. Dispose rags properly ac-
cording to local laws or regulations.
EMU27406
Gasoline and oil mixing (100:1)
ECM00811
NOTICE
G Avoid using any oil other than the spec-
ified type.
ZMU02301
G Use a thoroughly blended fuel-oil mix-
ture.
3. Remove the portable tank from the boat.
4. Be sure you are in a well-ventilated out-
door area, either securely moored or trail-
ered.
5. Do not smoke and keep away from
sparks, flames, static electric discharge,
or other sources of ignition.
G If the mixture is not thoroughly mixed, or
if the mixing ratio is incorrect, the fol-
lowing problems could occur.
G Low oil ratio: Lack of oil could cause ma-
jor engine trouble, such as piston sei-
zure.
6. If you use a portable container to store
and dispense fuel, use only an approved
GASOLINE container.
G High oil ratio: Too much oil could cause
fouled spark plugs, smoky exhaust, and
heavy carbon deposits.
7. Touch the fuel nozzle to the filler opening
or funnel to help prevent electrostatic
sparks.
Gasoline to engine oil
ratio
8. Fill the fuel tank, but do not overfill. Fuel
can expand and overflow if the tempera-
ture increases.
Break-in period
After break-in
See page 26
100:1
Fuel tank capacity:
24.0 L (6.34, US gal, 5.28 Imp.gal)
29
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Operation
4. Make sure that the oil and gasoline are
mixed.
If equipped with a built-in fuel tank
1. Pour oil into a clean fuel can, and then
add gasoline.
100:1
1 L
12 L
14 L
24 L
(0.26 US gal,
0.22 Imp gal)
(3.2 US gal,
2.6 Imp gal)
(3.7 US gal,
3.1 Imp gal)
(6.3 US gal,
5.3 Imp gal)
0.01 L
0.12 L
0.14 L
0.24 L
2. Replace the fuel can cap and close tight-
ly.
(0.01 US qt,
0.01 Imp qt)
(0.13 US qt,
0.11 Imp qt)
(0.15 US qt,
0.12 Imp qt)
(0.25 US qt,
0.21 Imp qt)
3. Shake the fuel can to mix the fuel thor-
oughly.
4. Make sure that the oil and gasoline are
mixed.
ZMU04910
1.
: Gasoline
2. : Engine oil
5. Pour the gasoline and oil mixture into the
built-in fuel tank.
If equipped with a portable fuel tank
1. Pour oil into the portable fuel tank, and
then add gasoline.
TIP:
If using a permanently installed tank, pour the
oil gradually as the gasoline is being added to
the tank.
EMU27451
Operating engine
ESMeU2n74d66ing fuel (portable tank)
EWM00420
WARNING
G 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.
G When the air vent screw is loosened,
gasoline vapor will be released. Gaso-
line is highly flammable, and its vapors
are flammable and explosive. Refrain
from smoking, and keep away from
open flames and sparks while loosening
the air vent screw.
G This product emits exhaust gases which
contain carbon monoxide, a colorless,
odorless gas which could cause brain
damage or death when inhaled. Symp-
toms include nausea, dizziness, and
1. Engine oil
2. Gasoline
2. Replace the fuel tank cap and close tight-
ly.
3. Shake the fuel tank to mix the fuel thor-
oughly.
30
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Operation
drowsiness. Keep cockpit and cabin ar-
eas well ventilated. Avoid blocking ex-
haust outlets.
TIP:
Wipe up any spilled gasoline immediately with
dry rags. Dispose rags properly according to
local laws or regulations.
3. Squeeze the primer pump, with the arrow
pointing up, until you feel it become firm.
During engine operation place the tank
horizontally, otherwise fuel cannot be
drawn from the fuel tank.
1. If there is an air vent screw on the fuel
tank cap, loosen it 2 or 3 turns.
ZMU02295
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.
1. Arrow
ESMtUa27r4t93ing 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 water near
you.
EMU27532
Manual start models
EWM01840
WARNING
G 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 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 entangled, preventing it
from functioning.
ZMU02024
31
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Operation
G 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 gear shift lever in neutral.
4. Pull out / turn the choke knob fully. Place
the choke knob back in to the second or
third position to warm up the engine after
starting. When the engine has fully
warmed up, replace the choke knob back
in to its home position.
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.
TIP:
G It is not necessary to use the choke when
starting a warm engine.
G If the choke knob is left in the pulled out po-
sition while the engine is running, the en-
gine will run poorly or stall.
5. Pull the manual starter handle slowly until
you feel resistance. Then give a strong
pull straight out to crank and start the en-
gine. Repeat if necessary.
3. Place the throttle grip in the “
”
(start) position.
32
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Operation
ECM01810
NOTICE
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 whether
the cooling water inlet on the lower case or
the cooling water pilot hole is blocked.
Consult your Yamaha dealer if the prob-
lem cannot be located and corrected.
6. After the engine starts, slowly return the
manual starter handle to its original posi-
tion before releasing it.
7. Slowly return the throttle grip to the fully
closed position.
TIP:
G When the engine is cold, it needs to be
warmed up. For further information, see
page 33.
ZMU02856
G If the engine does not start on the first try,
repeat the procedure. If the engine fails to
start after 4 or 5 tries, open the throttle a
small amount (between 1/8 and 1/4) and try
again. Also if the engine is warm and fails to
start, open the throttle a same amount and
try to start the engine again. If the engine
Check that no water leaks from the joints be-
tween the exhaust cover, cylinder head, and
body cylinder.
EMU27670
Warming up engine
ECMhU2o768k3e start models
still fails to start, see page 54.
EMU36510
After starting the engine, allow it to idle for 3
minutes to warm up. Failure to do so will
shorten engine life. Gradually return the
choke knob to its home position as the engine
Checks after starting engine
ECMoU3o652l0ing water
Check for a steady flow of water from the cool-
ing water pilot hole. A continuous flow of water
from the pilot hole shows that the water pump
is pumping water through the cooling passag-
es. If the cooling passages are frozen, it may
take a while for water to start flowing out of the
pilot hole.
warms up.
EMU36530
Checks after engine warm-up
ESMhU3i6f5t4i0ng
While tightly moored, and without applying
throttle, confirm that the engine shifts smooth-
ly into forward and reverse, and back to neu-
tral.
33
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Operation
ESMtUo36p970switches
G Press the engine stop button and make
sure the engine stops.
G Confirm that removing the clip from the en-
gine shut-off switch stops the engine.
G Confirm that the engine cannot be started
with the clip removed from the engine shut-
off switch.
EMU34550
Shifting
EWM00180
To shift from in gear (forward/reverse) to neu-
tral
WARNING
Before shifting, make sure there are no 1. Close the throttle so that the engine
swimmers or obstacles in the water near
you.
slows to idle speed.
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 en-
gine, shift to neutral, then restart the en-
gine and allow it to warm up.
ZMU02030
2. After the engine is at idle speed in gear
move the gear shift lever firmly and crisp-
ly into the neutral position.
To shift out of neutral
Move the gear shift lever firmly and crisply for-
ward (for forward gear) or backward (for re-
verse gear). Be sure to check that the tilt lock
lever is in the lock/down position (if equipped)
before operating in reverse.
34
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Operation
EMU31742
EWM01510
2. After stopping the engine, tighten the air
vent screw on the fuel tank cap and set
the fuel cock lever or knob to the closed
position, if equipped.
Stopping boat
WARNING
G Do not use the reverse function to slow
down or stop the boat as it could cause
you to lose control, be ejected, or impact
the steering wheel or other parts of the
boat. This could increase the risk of se-
rious injury. It could also damage the
shift mechanism.
G Do not shift into reverse while traveling
at planing speeds. Loss of control, boat
swamping, or damage to the boat could
occur.
ZMU02301
3. Disconnect the fuel line if you are using
an external fuel tank.
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 wind di-
rection.
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.
EPMrUo27c83e3 dure
1. Push and hold the engine stop button un-
TIP:
If the outboard motor is equipped with an en-
gine shut-off cord, the engine can also be
stopped by pulling the cord and removing the
clip from the engine shut-off switch.
til the engine comes to a complete stop.
EMU27T862rimming outboard motor
EWM00740
WARNING
Excessive trim for the operating condi-
tions (either trim up or trim down) can
cause boat instability and can make steer-
ing the boat more difficult. This increases
35
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Operation
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 an-
gle depends upon the combination of boat,
engine, and propeller. Correct trim is also af-
fected by variables such as the load in the
boat, sea conditions, and running speed.
1. Trim rod
3. Reposition the rod in the desired hole.
To raise the bow (“trim-out”), move the rod
away from the transom.
To lower the bow (“trim-in”), move the rod to-
ward the transom.
Make test runs with the trim set to different an-
gles to find the position that works best for
your boat and operating conditions.
EWM00400
WARNING
G Stop the engine before adjusting the
trim angle.
G Use care to avoid being pinched when
removing or installing the rod.
G Use caution when trying a trim position
for the first time. Increase speed gradu-
ally and watch for any signs of instability
or control problems. Improper trim an-
gle can cause loss of control.
1
ZMU02043
TIP:
The outboard motor trim angle can be
changed approximately 4 degrees by shifting
the trim rod one hole.
EAMdU2j7u91s1 ting 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-
1. Trim operating angle
EAMdU2j7u87s2 ting trim angle for manual tilt
models
There are 4 or 5 holes provided in the clamp
bracket to adjust the outboard motor trim an-
gle.
1. Stop the engine.
2. Tilt the outboard motor up, and then re-
move the trim rod from the clamp bracket.
36
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Operation
cy to steer to one side or the other. Compen- the bow is greatly increased, heightening the
sate for this as you steer. The trim tab can danger of “bow steering” and making opera-
also be adjusted to help offset this effect. tion difficult and dangerous.
When the bow of the boat is down, it is easier
to accelerate from a standing start onto plane.
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
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
Tilting up and down
boat is pushing the water and there is more air
drag. Excessive trim-out can also cause the
propeller to ventilate, which reduces perfor-
mance further, and the boat may “porpoise”
(hop in the water), which could throw the op-
erator and passengers overboard.
If the engine will be stopped for some time or
if the boat is moored in shallows, the outboard
motor should be tilted up to protect the propel-
ler and lower casing from damage by collision
with obstructions, and also to reduce salt cor-
rosion.
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 mo-
tor is trimmed or tilted.
EWM00250
WARNING
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.
Bow Down
Too much trim-in causes the boat to “plow”
through the water, decreasing fuel economy
and making it hard to increase speed. Operat-
ing with excessive trim-in at higher speeds
also makes the boat unstable. Resistance at
37
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Operation
ECM00241
NOTICE
G Before tilting the outboard motor, stop
the engine by following the procedure
on page 35. Never tilt the outboard mo-
tor while the engine is running. Severe
damage from overheating can result.
G Do not tilt up the engine by pushing the
tiller handle (if equipped) because this
could break the handle.
4. Pull up the shallow water lever (if
equipped).
5. Hold the rear of the top cowling with one
hand and tilt the engine up fully.
EPMrUo32c66e2 dure for tilting up (manual tilt
models)
1. Place the gear shift lever in neutral.
6. Push the tilt support knob into the clamp
bracket. Or the tilt support bar will turn to
the lock position automatically. NOTICE:
Do not use the tilt support lever or
knob when trailering the boat. The out-
board motor could shake loose from
the tilt support and fall. If the motor
cannot be trailered in the normal run-
ning position, use an additional sup-
port device to secure it in the tilt
position. For more detailed informa-
2. Disconnect the fuel line from the out-
board motor.
tion, see page 41.
[ECM01641]
EMU28022
3. Place the tilt lock lever (if equipped) in the
release/up position.
Procedure for tilting down (manual tilt
models)
1. Place the tilt lock lever in the re-
lease/down position or return the shallow
water lever to its original position.
38
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Operation
ZMU02868
EMU32741
2. Slightly tilt the engine up until the tilt sup-
port bar is automatically released.
3. Slowly tilt the engine down.
EMU28061
Procedure
1. Place the gear shift lever in neutral.
Shallow water
ECMrUu280i7s3ing in shallow water (manual tilt
models)
EWM01781
WARNING
G Run the boat at the lowest possible
speed when using the shallow water
cruising system. The tilt lock mecha-
nism does not work while the shallow
water cruising system is being used. Hit-
ting an underwater obstacle could
cause the outboard motor to lift out of
the water, resulting in loss of control.
G Use extra care when operating in re-
verse. Too much reverse thrust can
cause the outboard motor to lift out of
the water, increasing the chance of acci-
dent and personal injury.
2. Place the tilt lock lever in the release/up
position.
ECM00260
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-
ting up for and cruising in shallow water.
Otherwise severe damage from overheat-
ing can result.
3. Slightly tilt the outboard motor up. The tilt
support bar will lock automatically, sup-
porting the outboard motor in a partially
raised position. This outboard motor has
2 positions for shallow water cruising.
39
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Operation
acidic water or water with a lot of sediment in
it, such as muddy or turbid (cloudy) water. Af-
ter operating in such water, flush the cooling
passages with fresh water to prevent corro-
sion. Also rinse the outside of the outboard
motor with fresh water.
4. To return the outboard motor to the nor-
mal running position, place the gear shift
lever in neutral.
5. Place the tilt lock lever in the lock/down
position, then slightly tilt the outboard mo-
tor up until the tilt support bar automati-
cally returns to the free position.
ZMU02048
6. Slowly lower the outboard motor to the
normal position.
EMU28195
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.
Cruising in muddy, turbid, or acidic water
Yamaha strongly recommends that you use
the optional chromium-plated water pump kit
(see page 15) if you use the outboard motor in
40
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Maintenance
EMU28227
ECMlUa28m236p screw mounting models
When transporting or storing the outboard
motor while removed from a boat, keep the
outboard motor in the attitude shown.
Transporting and storing out-
board motor
EWM00693
WARNING
G USE CARE when transporting fuel tank,
whether in a boat or car.
G DO NOT fill fuel container to maximum
capacity. Gasoline will expand consider-
ably as it warms up and can build up
pressure in the fuel container. This can
cause fuel leakage and a potential fire
hazard.
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.
ECM00660
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 position, use an addi-
tional support device to secure it in the tilt
position.
TIP:
Place a towel or something similar under the
outboard motor to protect it from damage.
ESMtUo30r27i2ng 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 pri-
or to storage. However, you, the owner, with a
minimum of tools, can perform the following
procedures.
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 posi-
tion using a motor support device such as a
transom saver bar. Consult your Yamaha
dealer for further details.
41
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Maintenance
ECM01411
NOTICE
G 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 trouble.
G Store the outboard motor in a dry, well-
ventilated place, not in direct sunlight.
1
2
ZMU02051
EPMrUo28c30e4 dure
EMU28376
1. Water surface
2. Lowest water level
Flushing in a test tank
ECM00300
5. Fill the tank with fresh water to above the
level of the anti-cavitation plate. NOTICE:
If the fresh water level is below the lev-
el of the anti-cavitation plate, or if the
water supply is insufficient, engine
NOTICE
Do not run the engine without supplying it
with cooling water. Either the engine water
pump will be damaged or the engine will
be damaged from overheating. Before
starting the engine, be sure to supply wa-
ter to the cooling water passages.
seizure may occur.
[ECM00291]
6. Cooling system flushing is essential to
prevent the cooling system from clogging
up with salt, sand, or dirt. In addition, fog-
ging of the engine is mandatory to pre-
vent excessive engine damage due to
rust. Perform the flushing and fogging at
the same time. WARNING! Do not
touch or remove electrical parts when
starting or during operation. Keep
hands, hair, and clothes away from
the flywheel and other rotating parts
1. Wash the outboard motor body using
fresh water. NOTICE: Do not spray wa-
ter into the air intake.
information, see page 43.
[ECM01840]
For further
2. Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” to each gallon of fuel.
TIP:
while the engine is running.
[EWM00091]
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.
3. Remove the engine top cowling and si-
lencer cover.
4. Install the outboard motor on the test
tank.
7. Run the engine at a fast idle for 10–15
minutes in neutral position.
8. Just prior to turning off the engine, quickly
spray “Yamaha Stor-Rite Engine Fogging
Oil” alternately into each carburetor or the
fogging hole of the silencer cover, if
equipped. When properly done, the en-
gine will smoke excessively and almost
stall.
9. Remove the outboard motor from the test
tank.
42
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Maintenance
10. Drain the cooling water completely out of
the motor. Clean the body thoroughly.
11. Install the silencer cover/cap and top
cowling.
EMU28402
Lubrication
1. Install the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 48.
2. Change the gear oil. For instructions, see
page 51. Inspect the oil for the presence
of water that indicates a leaky seal. Seal
replacement should be performed by an
authorized Yamaha dealer prior to use.
3. Grease all grease fittings. For further de-
tails, see page 47.
ECMhU2e84c60king 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 available from
your Yamaha dealer.
TIP:
EMU37081 Periodic maintenance
For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
oil and procedures for your engine.
ECMlUe28a42n3 ing 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
EWM01981
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 mechan-
ic do the work.
into the air intake.
[ECM01840]
The procedures involve disassembling
the motor and exposing dangerous parts.
To reduce the risk of injury from moving,
hot, or electrical parts:
G Turn off the engine and keep engine
shut-off cord (lanyard) with you when
you perform maintenance unless other-
wise specified.
2. Spray the outboard motor exterior with
“Yamaha Silicone Protectant”.
3. Wax the cowling with a non-abrasive wax
such as “Yamaha Silicone Wax”.
ECMlUe28a45n1 ing the outboard motor
After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling sys-
tem with fresh water.
G Allow the engine to cool before handling
hot parts or fluids.
G Always completely reassemble the mo-
tor before operation.
Maintenance, replacement, or repair of the
emission control devices and systems
may be performed by any marine engine
43
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Maintenance
repair establishment or individual. All war-
ranty repairs, however, including those to
the emission control system, must be per-
formed by an authorized Yamaha marine
dealership.
A service manual is available for purchase
through your Yamaha dealer for owners who
have the mechanical skills, tools, and other
equipment necessary to perform mainte-
nance not covered by this owner’s manual.
ERMeU2p85l1a1 cement 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 pas-
sengers. Yamaha genuine parts and acces-
sories are available from your Yamaha
dealer.
EMU35520
Maintenance interval guidelines
The service intervals provided in the Mainte-
nance Chart were developed based upon
“typical” use that includes operating at varied
speeds, with sufficient time for engine warm
up and cool-down, a medium to light load, and
an average cruising speed near the 3000 to
4000 rpm range. As with any engine, howev-
er, if your normal operating conditions are dif-
ferent, you should consider service more
often than shown, especially how often you
change your engine and gear oil. Examples
might include extended wide-open-throttle
use or long periods of trolling or idling, carry-
ing heavy loads, or frequent starting and stop-
ping or shifting. More frequent maintenance
will often pay off many times over in increased
engine life and greater owner satisfaction.
Consult your Yamaha dealer for additional
maintenance recommendations.
44
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Maintenance
EMU34445
Maintenance chart 1
TIP:
G Refer to the sections in this chapter for explanations of each owner-specific action.
G 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 op-
erating the engine under adverse conditions such as extended trolling.
G Disassembly or repairs may be necessary depending on the outcome of maintenance
checks.
G Expendable or consumable parts and lubricants will lose their effectiveness over time and
through normal usage regardless of the warranty period.
G 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
Item
Actions
20 hours 100 hours 300 hours 500 hours
(3 months) (1 year) (3 years) (5 years)
Inspection or replace-
ment as necessary
Anode(s) (external)
Anode(s) (cylinder
head, thermostat cov-
er)
Inspection or replace-
ment as necessary
Anodes (exhaust cover,
cooling water passage
cover, Rectifier Regula-
tor cover)
Replacement
Inspection or replace-
ment as necessary
Cooling water leakage
Cowling lock lever
Inspection
Inspection
Engine starting condi-
tion/noise
Engine idling
speed/noise
Inspection
Fuel filter (can be dis-
assembled)
Inspection or replace-
ment as necessary
Fuel line(High pres-
sure)
Inspection
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
45
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Maintenance
Initial
Every
Item
Actions
20 hours 100 hours 300 hours 500 hours
(3 months) (1 year) (3 years) (5 years)
Inspection or replace-
ment as necessary
Fuel pump
Fuel/engine oil leakage Inspection
Gear oil
Replacement
Greasing
Greasing points
Impeller/water pump
housing
Inspection or replace-
ment as necessary
Impeller/water pump
housing
Replacement
Propeller/propeller
nut/cotter pin
Inspection or replace-
ment as necessary
Inspection, adjustment
or replacement as nec-
essary
Shift link/shift cable
Inspection or replace-
ment as necessary
Spark plug(s)
Spark plug caps/spark Inspection or replace-
plug wires
ment as necessary
Water from the cooling
water pilot hole
Inspection
Throttle link/throttle ca- Inspection, adjustment
ble/throttle pick-up tim- or replacement as nec-
ing
essary
Inspection or replace-
ment as necessary
Thermostat
Water inlet
Inspection
Main switch/stop
switch/choke switch
Inspection or replace-
ment as necessary
Wire harness connec-
tions/wire coupler con-
nections
Inspection or replace-
ment as necessary
Inspection and clean-
ing as necessary
(Yamaha) Fuel tank
EMU34451
Maintenance chart 2
Every
1000 hours
Item
Actions
Exhaust guide/exhaust Inspection or replace-
manifold ment as necessary
46
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Maintenance
ECMlUe28a95n6 ing and adjusting spark plug
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate something about
the condition of the engine. For example, 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 di-
agnose any problems yourself. Instead, take
the outboard motor to a Yamaha dealer. You
should periodically remove and inspect the
spark plug because heat and deposits will
cause the spark plug to slowly break down
and erode.
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.9–1.0 mm (0.035–0.039 in)
1. Remove the spark plug caps from the
spark plugs.
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
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 another of the
correct type. WARNING! When remov-
ing or installing a spark plug, be care-
ful not to damage the insulator. A
damaged insulator could allow exter-
nal sparks, which could lead to explo-
Spark plug torque:
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)
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 finger-
tight. Have the spark plug adjusted to the cor-
rect torque as soon as possible with a torque-
wrench.
sion or fire.
[EWM00561]
Standard spark plug:
B7HS-10
ECMhU3e74c50king fuel filter
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; replace it if out of spec-
ification.
EInMUs29p04e3 cting idling speed
EWM00451
WARNING
G Do not touch or remove electrical parts
when starting or during operation.
48
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Maintenance
ECMhU3e21c12king propeller
G Keep hands, hair, and clothes away from
the flywheel and other rotating parts
while the engine is running.
EWM01881
WARNING
ECM00490
You could be seriously injured if the en-
gine accidentally starts when you are near
the propeller. Before inspecting, remov-
ing, or installing the propeller, place the
shift control in neutral, turn the main
NOTICE
This procedure must be performed while
the outboard motor is in the water. A flush-
ing attachment or test tank can be used.
switch to “
” (off) and remove the key,
If the boat is not equipped with a tachometer
for the outboard motor, use a diagnostic ta-
chometer for this procedure. Results may
vary depending on whether testing is conduct-
ed 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 smoothly.
2. Once the engine has warmed up, verify
whether the idle speed is set to specifica-
tion. For idle speed specifications, see
page 12. If you have difficulty verifying
the idle speed, or the idle speed requires
adjustment, consult a Yamaha dealer or
other qualified mechanic.
and remove the clip from the engine shut-
off switch. Turn off the battery cut-off
switch if your boat has one.
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.
ECMhU2e91c13king wiring and connectors
G Check that each connector is engaged se-
curely.
ZMU01897
G Check that each ground lead is properly se-
cured.
Checkpoints
G Check each of the propeller blades for ero-
sion from cavitation or ventilation, or other
damage.
G Check the propeller shaft for damage.
G Check the splines for wear or damage.
G Check for fish line tangled around the pro-
peller shaft.
ZMU02087
49
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Maintenance
EInMUs30t6a72lling propeller
EMU29233
Spline models
ECM00500
NOTICE
Be sure to use a new cotter pin and bend
the ends over securely. Otherwise the pro-
peller could come off during operation and
be lost.
1. Apply Yamaha marine grease or a corro-
sion resistant grease to the propeller
shaft.
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 before
installing the propeller, otherwise the
lower case and propeller boss could
G Check the propeller shaft oil seal for dam-
age.
ERMeU3m066o2 ving propeller
EMU29197
Spline models
1. Straighten the cotter pin and pull it out us-
ing a pair of pliers.
2. Remove the propeller nut, washer, and
spacer (if equipped). WARNING! Do not
use your hand to hold the propeller
when loosening the propeller nut.
[EWM01890]
be damaged.
[ECM01880]
3. Install the spacer (if equipped) and the
washer. Tighten the propeller nut to the
specified torque.
1
Propeller nut tightening torque:
17.0 Nm (1.73 kgf-m, 12.5 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.
NOTICE: Do not reuse the cotter pin
installed. Otherwise the propeller can
2
3
4
5
ZMU02877
come off during operation.
[ECM01890]
1. Cotter pin
2. Propeller nut
3. Washer
4. Propeller
5. Thrust washer
3. Remove the propeller, washer (if
equipped), and thrust washer.
50
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Maintenance
TIP:
TIP:
If the propeller nut does not align with the pro- G If a magnetic gear oil drain screw is
peller shaft hole after tightening to the speci-
fied torque, tighten the nut further to align it
with the hole.
equipped, remove all metal particles from
the screw before installing it.
G Always use new gaskets. Do not reuse the
removed gaskets.
4. Remove the oil level plug and gasket to
allow the oil to drain completely.
NOTICE: 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. Con-
sult a Yamaha dealer for repair of the
ECMhU2a92n87ging gear oil
EWM00800
WARNING
G 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.
G Never get under the lower unit while it is
tilted, even when the tilt support lever or
knob is locked. Severe injury could oc-
cur if the outboard motor accidentally
falls.
lower unit seals.
[ECM00711]
TIP:
For disposal of used oil, consult your Yamaha
dealer.
5. Put the outboard motor in a vertical posi-
tion. Using a flexible or pressurized filling
device, inject the gear oil into the gear oil
drain screw hole.
1. Tilt the outboard motor so that the gear oil
drain screw is at the lowest point possi-
ble.
2. Place a suitable container under the gear
case.
3. Remove the gear oil drain screw and gas-
ket. NOTICE: If there is an excessive
quantity of metal particles on the mag-
netic gear oil drain screw, this can in-
dicate lower unit problem. Consult
Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
0.250 L (0.264 US qt, 0.220 Imp.qt)
your Yamaha dealer.
[ECM01900]
2
ZMU02065
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.
1
ZMU02064
1. Gear oil drain screw
2. Oil level plug
51
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Maintenance
Tightening torque:
9.0 Nm (0.92 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.
Tightening torque:
9.0 Nm (0.92 kgf-m, 6.6 ft-lb)
ECMlUe29a30n2 ing fuel tank
EWM00920
WARNING
Gasoline is highly flammable, and its va-
pors are flammable and explosive.
G If you have any question about properly
doing this procedure, consult your
Yamaha dealer.
G Keep away from sparks, cigarettes,
flames, or other sources of ignition
when cleaning the fuel tank.
G Remove the fuel tank from the boat be-
fore cleaning it. Work only outdoors in
an area with good ventilation.
ZMU03231
3. Remove the screws holding the fuel joint
assembly. Pull the assembly out of the
tank.
G Wipe up any spilled fuel immediately.
G Reassemble the fuel tank carefully. Im-
proper assembly can result in a fuel
leak, which could result in a fire or ex-
plosion hazard.
G Dispose of old gasoline according to lo-
cal regulations.
1. Empty the fuel tank into an approved con-
tainer.
2. Pour a small amount of suitable solvent
into the tank. Install the cap and shake
the tank. Drain the solvent completely.
ZMU02324
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
the screws firmly.
52
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Maintenance
EInMUs29p31e2 cting 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
anodes.
ECM00720
NOTICE
Do not paint anodes, as this would render
them ineffective.
TIP:
Inspect ground leads attached to external an-
odes on equipped models. Consult a Yamaha
dealer for inspection and replacement of inter-
nal anodes attached to the power unit.
ZMU02067
53
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Trouble Recovery
EMU29427
Q. Is fuel filter clogged?
A. Clean or replace filter.
Troubleshooting
A problem in the fuel, compression, or ignition
systems can cause poor starting, loss of pow-
er, or other problems. This section describes
basic checks and possible remedies, and cov-
ers all Yamaha outboard motors. Therefore
some items may not apply to your model.
If your outboard motor requires repair, bring it
to your Yamaha dealer.
Q. Is starting procedure incorrect?
A. See page 31.
Q. Has fuel pump malfunctioned?
A. Have serviced by a Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace with
recommended type.
If the engine trouble-alert indicator is flashing,
consult your Yamaha dealer.
Starter will not operate.
Q. Is battery capacity weak or low?
A. Check battery condition. Use battery of rec-
ommended capacity.
Q. Are spark plug cap(s) fitted incorrectly?
A. Check and re-fit cap(s).
Q. Is ignition wiring damaged or poorly con-
nected?
A. Check wires for wear or breaks. Tighten all
loose connections. Replace worn or broken
wires.
Q. Are battery connections loose or corrod-
ed?
A. Tighten battery cables and clean battery
terminals.
Q. Is fuse for electric start relay or electric cir-
cuit blown?
A. Check for cause of electric overload and
repair. Replace fuse with one of correct am-
perage.
Q. Are ignition parts faulty?
A. Have serviced by a Yamaha dealer.
Q. Is engine shut-off cord (lanyard) not at-
tached?
A. Attach cord.
Q. Are starter components faulty?
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?
A. Inspect spark plug(s). Clean or replace with
recommended type.
Engine will not start (starter operates).
Q. Is fuel tank empty?
A. Fill tank with clean, fresh fuel.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is fuel system obstructed?
54
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Trouble Recovery
A. Check for pinched or kinked fuel line or oth- A. Return to home position.
er obstructions in fuel system.
Q. Is motor angle too high?
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
A. Return to normal operating position.
Q. Is carburetor clogged?
Q. Is fuel filter clogged?
A. Clean or replace filter.
A. Have serviced by a Yamaha dealer.
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 ignition wiring damaged or poorly con- Q. Is cooling system clogged?
nected?
A. Check water intake for restriction.
A. Check wires for wear or breaks. Tighten all
loose connections. Replace worn or broken Q. Is engine oil level low?
wires.
A. Fill oil tank with specified engine oil.
Q. Is specified engine oil not being used?
A. Check and replace oil as specified.
Q. Is heat range of spark plug incorrect?
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 deteriorated?
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.
55
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Trouble Recovery
Q. Is load on boat improperly distributed?
A. Remove foreign matter and clean lower
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 oth-
er 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 outboard
at its recommended speed (r/min) range.
A. Inspect and adjust as specified.
Q. Is ignition wiring damaged or poorly con-
nected?
Q. Is trim angle incorrect?
A. Check wires for wear or breaks. Tighten all
A. Adjust trim angle to achieve most efficient loose connections. Replace worn or broken
operation. wires.
Q. Is motor mounted at incorrect height on Q. Have electrical parts failed?
transom?
A. Have serviced by a Yamaha dealer.
A. Have motor adjusted to proper transom
height.
Q. Is specified fuel not being used?
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?
A. Clean boat bottom.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect
type?
Q. Is air vent screw closed?
A. Inspect spark plug(s). Clean or replace with A. Open the air vent screw.
recommended type.
Q. Is fuel pump damaged?
Q. Are weeds or other foreign matter tangled A. Have serviced by a Yamaha dealer.
on gear housing?
Q. Is fuel joint connection incorrect?
56
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Trouble Recovery
A. Connect correctly.
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 compo-
nents 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.
ESMtUa29r5t33er 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-
Q. Are weeds or other foreign matter tangled
on propeller?
A. Remove and clean propeller.
Q. Is motor mounting bolt loose?
A. Tighten bolt.
gency starter rope.
EWM01022
WARNING
Q. Is steering pivot loose or damaged?
A. Tighten or have serviced by a Yamaha
dealer.
G Use this procedure only in an emergen-
cy to return to the nearest port for re-
pairs.
G When the emergency starter rope is
used to start the engine, the start-in-
gear protection device does not operate.
Make sure the remote control lever is in
neutral. Otherwise the boat could unex-
pectedly start to move, which could re-
sult in an accident.
ETMeU29m433porary action in emergency
EImMU2p94a40ct damage
EWM00870
WARNING
The outboard motor can be seriously dam-
aged by a collision while operating or
trailering. Damage could make the out-
board motor unsafe to operate.
G Attach the engine shut-off cord to a se-
cure place on your clothing, or your arm
or leg while operating the boat.
57
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Trouble Recovery
G 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.
G 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.
G Make sure no one is standing behind
you when pulling the starter rope. It
could whip behind you and injure some-
one.
G An unguarded, rotating flywheel is very
dangerous. Keep loose clothing and
other objects away when starting the en-
gine. Use the emergency starter rope
only as instructed. Do not touch the fly-
wheel or other moving parts when the
engine is running. Do not install the
starter mechanism or top cowling after
the engine is running.
G Do not touch the ignition coil, spark plug
wire, spark plug cap, or other electrical
components when starting or operating
the motor. You could get an electrical
shock.
4. Prepare the engine for starting. For fur-
ther information, see page 31. 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.
5. If equipped the choke knob, pull out it
when the engine is cold. After the engine
starts, gradually return the choke knob to
its home position as the engine warms
up.
6. 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.
7. Give a strong pull straight out to crank
and start the engine. Repeat if neces-
sary.
EEMmU29e56r2gency starting engine
1. Remove the top cowling.
2. Remove the start-in-gear protection ca-
ble from the starter, if equipped.
3. Remove the starter/flywheel cover after
removing the bolt(s).
58
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Trouble Recovery
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 immediate-
ly. NOTICE: Do not attempt to run the out-
board motor until it has been completely
inspected.
[ECM00401]
59
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Consumer information
61
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Consumer information
62
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