Briggs Stratton 310700 User Manual

Before starting this engine, read and understand  
this Operator/Owner Manual. Failure to follow instructions  
in this manual could result in serious injury or death.  
Operator/Owner Manual  
Model Series 28N700, 287700,  
28P700, 28Q700, 28S700, 28U700,  
310700, 311700, 312700, 313700  
Model  
Type  
Code  
For future reference, write your engine Model/Type/Code here.  
For future reference, write your engine Date of Purchase here.  
Table of Contents  
In the Interest of Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Oil & Fuel Recommendations . . . . . . . . . . . . . . . . . . . . . . 3  
Starting & Stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4  
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
Service, Storage & Specifications . . . . . . . . . . . . . . . . . . 9  
Emission System Warranty . . . . . . . . . . . . . . . . . . . . . . . 10  
About Engine Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
Engine Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
Briggs & Stratton Corporation  
Milwaukee, Wisconsin 53201  
FORM NO. 273683-7/98  
PRINTED IN U.S.A.  
Copyright 1998 by Briggs & Stratton Corporation  
Oil & Fuel Recommendations  
Oil  
Fuel  
This engine is shipped from Briggs & Stratton without oil.  
Before starting engine, check oil level as shown below.  
Use clean, fresh, regular unleaded gasoline with a minimum  
of 85 octane. Do not mix oil with gasoline. Fresh fuel prevents  
gum from forming in fuel system or on essential carburetor  
parts. Purchase fuel in quantity that can be used within 30  
days. In countries other than the U.S.A., leaded gasoline may  
be used if commercially available and unleaded is unavailable.  
We recommend the use of Briggs & Stratton Gasoline Additive.  
(See your Authorized Briggs & Stratton Service Dealer for  
Part No. 5041 or the single-use pouch.) See storage instruc-  
tions, on page 9.  
Note: Some fuels, called oxygenated or reformulated  
gasolines, are gasolines blended with alcohols or ethers.  
Excessive amounts of these blends can damage the fuel  
system or cause performance problems. Do not use gasoline  
which contains Methanol. If any undesirable operating  
symptoms occur, use gasoline with a lower percentage of  
alcohol or ether.  
Change and add oil according to chart below. Do not over-fill.  
Use a high quality detergent oil classified “For Service SF,  
SG, SH,” such as Briggs & Stratton “warranty certified” SAE  
30 oil, Part No. 100005. Use no special additives with recom-  
mended oils. Do not mix oil with gasoline.  
SAE Viscosity Grades  
**  
*
20  
32  
0
40  
60  
80  
100  
-20  
°F  
°C -30  
0
-20  
-10  
10  
20  
30  
40  
STARTING TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE  
*
Air cooled engines run hotter than automotive engines. The use of  
multi-viscosity oil such as (10W-30, etc.) in ambient temperatures  
above 40° F (4° C) will result in higher than normal oil consumption.  
If multi-viscosity oil is used, check the oil level more frequently to  
prevent any possible engine damage due to lack of lubrication.  
** Use of SAE 30 oil below 40° F (4° C) will result in hard starting  
and possible engine damage due to inadequate lubrication.  
Do not over-fill fuel tank.  
Allow space for fuel expansion.  
Check oil level before starting engine.  
Add oil as shown below.  
4
3
Oil capacity is about 1-1/2 quarts (48 ounces or 1.4 liter).  
Oil capacity is about 1-1/2 quarts (48 ounces or 1.4 liters) if  
engine is not equipped with oil filter.  
2
Oil capacity is about 1-3/4 quarts (56 ounces or 1.7 liters) if  
engine is equipped with oil filter.  
After filling with or changing oil, start and run engine at idle for  
30 seconds. Shut engine off. Wait 30 seconds and check oil  
level. Add oil, if required, to bring level to Full mark on dipstick.  
1. Oil drain  
2. Oil fill/Dipstick  
3. Rotating screen  
5
4. Blower housing  
6
1
5. Muffler  
6. 12V electric starter  
12  
7
Place engine level.  
Remove dipstick.  
Tighten dipstick.  
Clean around oil fill. Wipe with clean cloth. Remove & check.  
11  
7. Air cleaner  
8. In-line fuel filter,  
if equipped  
8
9
9. Carburetor  
10  
10. Oil filter, if equipped  
11. Spark plug wire  
12. Engine Model  
Type  
Code  
xxxxxxxx  
Oil level should  
be at FULL mark. slowly. Recheck level. fore starting engine.  
If oil is required, add Tighten dipstick be-  
xxxxxx xxxx xx  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
3
Starting & Stopping  
Choke operation/engine warm-up  
Start engine  
Always keep hands and feet clear of mower blade or  
This engine is a low emissions engine which operates differently  
from previously built engines. It is designed for maximum  
performance and life if operated with the choke fully open (in  
RUN)andthrottlefullyopen(inFAST). Toopenthechokefully  
requires an engine warm-up period of several seconds to  
several minutes, depending on the temperature.  
After starting engine, first open the choke (toward RUN) until  
the engine just begins to run smoothly. Then open the choke in  
small steps, allowing the engine to accept small changes in  
speed and load, until the choke is fully open (in RUN).  
other rotating machinery.  
Electric starter  
Turn key to START or press button. Repeat if necessary with  
throttle control in FAST position. Operate engine in FAST  
position.  
Note: If equipment manufacturer has supplied battery, charge it  
before trying to start engine, as equipment manufacturer recom-  
mends. Use short starting cycles (15 secs. per min.) to prolong  
starter life. Extended cranking can damage starter motor.  
During engine warm-up, the equipment can be operated.  
To obtain best starting results  
PRESS  
BUTTON  
Store and fuel lawn mower in level position.  
Start lawn mower on hard surface or over previously cut grass.  
Do not use a pressurized starting fluid. Starting fluid is  
flammable. Severe engine damage or fire may occur.  
Periodically remove grass build-up under mower  
deck. Removesparkplugwirebeforeremovinggrass.  
When tipping lawn mower to remove grass, keep  
spark plug side of engine up.  
Typical electric starter  
Rewind starter (auxiliary), if equipped  
If your engine is equipped  
with an auxiliary rewind  
starter, grasp rope handle  
A warm engine requires less choking than a cold engine.  
as illustrated and pull slowly until  
resistance is felt. Then pull cord  
rapidly to overcome compres-  
sion, prevent kickback and start  
engine. Repeat if necessary with  
choke off and throttle control in  
Starting in cold weather:  
Use the correct oil for the starting temperature expected.  
De-clutch all possible external loads.  
Set speed control at part throttle position.  
A warm battery has more starting capacity than a cold battery.  
Do not use gasoline left over from summer. Use fresh winter  
grade gasoline which has higher volatility to improve starting.  
FAST position. Operate engine  
in FAST position.  
Rewind starter  
Stop engine  
Do not move choke control to CHOKE position to stop engine.  
Backfire or engine damage may occur.  
Keep throttle control in FAST position. Turn key to OFF.  
Alwaysremovekeyfromswitch, ifequipped, whenequipment  
is not in use or left unattended.  
Before starting engine  
Move choke control to CHOKE or START position.  
If equipment has separate choke and throttle controls, move  
throttle control to FAST position.  
Note: Choke must fully close. If engine does not start, see  
control adjustments on page 5.  
Typical stop controls  
Typical choke and throttle controls  
When engine is transported,  
close fuel shut-off valve (if  
equipped) to prevent fuel  
leakage.  
Open fuel shut-off valve, if  
equipped.  
1/4 TURN  
1/4 TURN  
Typical fuel shut-off  
Typical fuel shut-off  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
4
Adjustments  
Control adjustments  
Carburetor adjustments  
The manufacturer of the equipment on which this  
WIRE  
engine is installed specifies top speed at which the  
engine will be operated. DO NOT EXCEED this  
speed.  
To prevent accidental starting, remove  
and ground spark plug wire and dis-  
connect battery at negative terminal, if  
equipped, when adjusting controls.  
Differences in fuel, temperature, altitude or load may require  
minor carburetor adjustment. Air cleaner and air cleaner cover  
must be assembled to carburetor before starting engine.  
Remote choke control:  
The carburetor on this engine is low emission. It is equipped  
with an idle mixture valve with a limiter (see inset), which allows  
some adjustment, and an idle speed adjustment screw.  
Move choke control to CHOKE or START position. Choke  
valve should be closed. To assure choke valve is closed,  
loosen casing clamp screw and pull casing, wire and choke  
lever in direction of arrow to end of travel. With choke control  
in CHOKE or START position, tighten casing clamp screw.  
Adjustments  
Start engine and warm up approximately 5 minutes before  
adjusting. Withenginerunning, placethrottlecontrolinSLOW  
position. Rotate carburetor throttle lever against the idle  
speed screw and hold it. Turn idle speed screw to obtain 1750  
rpm.  
CASING CLAMP SCREW  
Rotate idle mixture valve full travel clockwise and then  
counterclockwise. Finally, position idle mixture valve in  
middle of travel. Check idle speed and re-adjust to 1750 rpm,  
if necessary.  
Move throttle control to FAST position. Engine should  
accelerate smoothly. If it does not, adjust idle mixture valve  
counterclockwise 1/8 turn.  
Choke control adjustment  
CARBURETOR  
THROTTLE  
LEVER  
To adjust throttle control:  
IDLE MIXTURE  
VALVE  
WITH LIMITER  
With throttle control in FAST position, hole in governor control  
lever (located just behind governor control plate) must align  
with hole in governor control plate, as illustrated below. If it  
does not, loosen casing clamp screw and then move gover-  
nor control rack until it does. Tighten casing clamp screw.  
IDLE SPEED  
SCREW  
Check stop switch  
Move throttle control to STOP position, if equipped. Governor  
control lever must make good contact with stop switch.  
Check operation of controls. Readjust if necessary.  
HOLE IN  
GOVERNOR  
CONTROL  
PLATE  
GOVERNOR  
CONTROL  
LEVER  
STOP  
SWITCH  
Carburetor adjustments  
GOVERNOR  
CONTROL  
RACK  
CASING  
CLAMP  
SCREW  
Throttle control adjustment  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
5
See Maintenance Schedule, page 8. Follow the hourly or calendar intervals, whichever occur first.  
Note that more frequent service is required when operating in adverse conditions.  
Maintenance  
Air cleaner  
WIRE  
To prevent accidental starting, remove  
and ground spark plug wire and dis-  
connect battery at negative terminal, if  
equipped, when adjusting controls.  
COVER  
KNOB  
COVER  
Oil  
CARTRIDGE  
KNOB  
Check oil level regularly.  
Be sure correct oil level is maintained. Check every 8 hours or  
daily, before starting engine. See check oil level on page 3.  
CARTRIDGE &  
PRE-CLEANER  
5053  
Change oil (Follow Maintenance Schedule.)  
STUD  
Change oil after first 5 hours of operation. Change oil while  
engine is warm.  
Remove drain plug and drain oil. Replace and tighten drain  
plug. Remove dipstick and refill with new oil of recommended  
grade (see chart, page 3). Start and run engine at idle for  
30 seconds. Stop engine. Wait 30 seconds and re-check oil  
level. If required, add oil to bring level to FULL mark on dipstick.  
BASE  
Dual element air cleaner  
Note: Depending on engine Type Number, this engine may  
not be equipped with a pre-cleaner.  
PIPE  
7/16”  
1. Remove cover knob and cover.  
2. Remove cartridge knob. Carefully lift pre-cleaner and  
cartridge from base over stud.  
HEX  
5/16”  
3. Clean base carefully to prevent debris from entering  
carburetor.  
TO REMOVE  
OIL DRAIN  
PLUG  
To service pre-cleaner, wash in liquid detergent and water.  
Squeeze dry in a clean cloth. Saturate in engine oil. Squeeze  
inclean, absorbentclothtoremoveallEXCESSoil. Replaceif  
very dirty or damaged.  
Typical  
drain  
plugs  
Oil drain  
Oil fill  
To service cartridge, clean by tapping gently on a flat surface.  
Do not oil cartridge. Replace if very dirty or damaged.  
Change oil filter, if equipped  
(Follow Maintenance Schedule.)  
Replace oil filter after every 100 hours of operation or every  
season, whichever occurs first. Before installing new filter,  
lightly oil filter gasket with fresh, clean engine oil. Screw filter  
on by hand until gasket contacts oil filter adapter. Tighten 1/2  
to 3/4 turn more. Start and run engine at idle to check for oil  
leaks. Recheck oil level and add oil if required.  
R
PRE-CLEANER  
272403  
CARTRIDGE  
496894  
Pre-cleaner  
Cartridge  
Note: Do not use petroleum solvents, e.g., kerosene, which will  
cause the cartridge to deteriorate. Do not use pressurized air to  
clean cartridge. Pressurized air can damage the cartridge.  
OIL FILTER  
P/N SEE PAGE 8  
4. Reassemble pre-cleaner on cartridge and place assembly  
over stud on base. Tighten cartridge knob.  
Oil filter  
5. Replace cover and tighten cover knob securely.  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
6
See Maintenance Schedule, page 8. Follow the hourly or calendar intervals, whichever occur first.  
Note that more frequent service is required when operating in adverse conditions.  
Maintenance  
Keep engine and parts clean.  
Grass, chaff or debris may clog the air cooling system, especial-  
ly after prolonged operation cutting tall, dry grass. Remove  
blower housing and clean area shown to prevent overheating  
and engine damage. Clean more often if necessary.  
Do not clean with a forceful spray of water because water  
could contaminate fuel system.  
With a brush or cloth,  
CLEAN  
CLEAN  
CLEAN OUT  
CHAFF AND  
DEBRIS  
remove grass, chaff or  
debris from finger guard  
or rotating screen daily  
(more often if needed)  
to prevent engine dam-  
age caused by over-  
heating.  
Finger guard Rotating screen  
To assure smooth  
operation, keep gover-  
nor linkage, springs  
and controls free of  
debris.  
Air cooling system  
Replace spark plug. Do  
.030” (0.76 mm)  
WIRE GAGE  
not blast clean. Clean by  
CLEAN  
scraping or wire brushing  
and washing with  
commercial solvent.  
a
Linkage, springs & controls  
Use only Briggs & Strat-  
ton Spark Tester, Part No.  
19368, to check for spark.  
If engine muffler is equipped with spark arrester screen,  
remove for cleaning and inspection. Replace if damaged or  
plugged. See an Authorized Briggs & Stratton Service Dealer  
for correct replacement.  
RESISTOR  
PART NO. 491055  
Spark plug  
Note: In some areas, local law requires using resistor spark plug  
to suppress ignition signals. If this engine was originally equipped  
with resistor spark plug, use same type for replacement.  
CLEAN  
Replace in-line fuel filter.  
FILTER  
Daily or more often,  
before running en-  
See any Authorized  
Briggs & Stratton Dealer  
for correct replacement.  
ARRESTER  
gine, clean muffler  
area to remove all  
grass and combus-  
tible debris.  
Drain fuel tank or  
PART NO. 394358  
(WITH FUEL PUMP)  
P/N 298090 OR 5018  
(WITHOUT FUEL PUMP)  
close fuel shut-off  
valve before re-  
placing fuel filter.  
CLEAN  
Muffler and spark arrester  
In-line fuel filter  
See any Authorized Briggs & Stratton  
Fill in both sides, clip and return to:  
Briggs & Stratton Corporation  
P.O. Box 1144  
273683  
Service Dealer. Insist on Genuine  
Briggs & Stratton parts! Non-original  
parts may not perform as well and  
may void your warranty.  
Milwaukee, WI 53201-1144 U.S.A.  
Name  
To obtain a complete Parts List of  
Genuine Briggs & Stratton Parts for  
your engine, fill in both sides of this Address  
order form carefully. We cannot fill  
your order without the correct  
Engine Model/Type/Code. (Please  
allow 3 to 4 weeks for delivery.)  
City  
State  
Zip  
County  
Your Engine  
Model  
Type  
Code  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
7
273683  
Maintenance Schedule  
More frequent service is required when operating in adverse conditions noted below.  
Follow the hourly or calendar intervals, whichever occur first.  
Every 8 Hours  
or Daily  
25 Hours or  
Every Season Every Season Every Season  
50 Hours or  
100 Hours or  
Maintenance Operation  
Check oil level  
Yearly  
D
D
Change oil  
Note 1  
Replace oil filter, if equipped  
D
Service air cleaner pre-cleaner, if  
equipped  
D
Note 2  
Service air cleaner cartridge,  
if not equipped with pre-cleaner  
D
Note 2  
Service air cleaner cartridge,  
if equipped with pre-cleaner  
D
Note 2  
Inspect spark arrester,  
if equipped  
D
D
Clean cooling system  
Note 2  
Replace spark plug and  
fuel filter, if equipped  
D
Check valve clearance  
D
Change oil after first 5 hours, then after every 50 hours or every season.  
Note 1: Change oil every 25 hours when operating under heavy load or in high temperatures.  
Clean more often under dusty conditions or when airborne debris is present.  
Replace air cleaner parts, if very dirty.  
Note 2:  
Briggs & Stratton Part Numbers of some  
Briggs & Stratton Part Numbers of some  
Genuine Briggs & Stratton Parts:  
Genuine Briggs & Stratton Parts:  
Part  
Briggs & Stratton Part No.  
Part  
Briggs & Stratton Part No.  
Air cleaner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . 496894  
Air cleaner pre-cleaner . . . . . . . . . . . . . . . . . . . . . . . . 272403  
Air cleaner cartridge & pre-cleaner . . . . . . . . . . . . . . . . 5053  
Resistor spark plug . . . . . . . . . . . . . . . . . . . . . . . . . . . 491055  
Spark plug wrench . . . . . . . . . . . . . . . . . . . . . 89838 or 5023  
Spark tester . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19368  
Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100005 or 100028  
Oil filter (3-1/2 in. long) . . . . . . . . . . . . . . . . . . . . . . . . 491056  
Oil filter (2-1/4 in. long) . . . . . . . . . . . . . . . . . . . . . . . . 492932  
Fuel filter (with fuel pump) . . . . . . . . . . . . . . . . . . . . . 394358  
Fuel filter (without fuel pump) . . . . . . . . . . . . . . . . . . 298090  
Gas additive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5041  
Only Genuine Briggs  
Fill in both sides of this order form carefully  
Payment Method:  
&
Stratton Parts  
have the Briggs &  
Stratton logo!  
j Check or money order enclosed payable to  
Briggs & Stratton Corporation in the amount of $________  
(U.S. Dollars, please)  
j Please charge my j MasterCard  
j VISA  
__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __  
CREDIT CARD NUMBER  
SIGNATURE (REQUIRED FOR CREDIT CARD ORDERS  
EXPIRATION DATE  
Parts List  
$2.00  
$1.50  
Shipping & Handling  
**Add State Sales Tax  
Total  
Ad d sa le s ta x if you live in a ny of the following sta te s:  
**AL 5%, CT 6%, FL 6.5%, GA 4%, KY 6%, MI 6%, MN 6%,  
MO4.225%, NY8.5%, OH5%, TN6%, TX6.25%, WA6.5%,ĂWI5%  
Look for Briggs & Stratton logo  
stamped on part and/or package!  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
8
Service, Storage & Specifications  
For service  
Storage instructions  
See an Authorized Briggs & Stratton Service Dealer. Each  
one carries a stock of Genuine Briggs & Stratton Parts and is  
equipped with special service tools. Trained mechanics  
assure expert repair service on all Briggs & Stratton engines.  
Only dealers advertising as “Authorized Briggs & Stratton”  
are required to meet Briggs & Stratton standards.  
Engines stored over 30 days need to be protected or drained  
of fuel to prevent gum from forming in fuel system or on  
essential carburetor parts.  
1. For engine protection, we recommend use of  
Briggs & Stratton Gasoline Additive, Part No.  
5041, available from an Authorized Briggs &  
Stratton Service Dealer. Mix Additive with  
fuel in fuel tank or storage container. Run  
engine for a short time to circulate Additive  
through carburetor. Engine and fuel can be  
When you purchase equipment powered by a  
Briggs & Stratton engine, you are assured of  
highly skilled, reliable service at more than  
30,000 Authorized Service Dealers worldwide,  
including more than 2,700 Master Service  
Technicians. Look for these signs wherever  
Briggs & Stratton service is offered.  
P/N 5041  
stored up to 24 months.  
Your Service Dealer has single-use  
You may locate your nearest Authorized Briggs &  
Stratton Service Dealer in the “Yellow Pages ”  
directory under “Engines, Gasoline” or “Gasoline  
Engines,” or “Lawn Mowers” or similar category.  
Or log on to our dealer locator map on our web site  
pouches of Gasoline Additive available.  
Note: If engine is operating on oxygenated or reformulated  
gasoline (gasoline blended with an alcohol or an ether),  
remove all fuel from tank and run engine until it stops from  
lack of fuel. If engine is stored with gasoline in fuel tank, we  
recommend the use of Gasoline additive, Part No. 5041.  
Note: Walking fingers logo and “Yellow Pages” are registered  
trademarks in various jurisdictions.  
The illustrated shop manual shown here  
includes “Theories of Operation,” com-  
mon specifications and detailed informa-  
tion covering adjustment, tune-up and  
repair of Briggs & Stratton single cylinder,  
overhead valve, 4 cycle engines. It is  
available from an Authorized Briggs &  
Stratton Service Dealer or you can order  
it from the factory. Write:  
2. While engine is still warm, drain oil from crankcase  
(see page 6). Refill with fresh oil of recommended grade  
(see chart page 3).  
3. Remove spark plug and pour about 1 oz (30 ml) of engine  
oil into cylinder. Replace spark plug and crank slowly to  
distribute oil.  
4. Clean dirt and chaff from cylinder, cylinder head fins, blower  
housing, rotating screen and muffler area (see page 7).  
Briggs & Stratton Corporation  
Attn: Service Division  
P. O. Box 1144  
Part No. 272147  
5. Store in a clean and dry area, but NOT near a stove,  
furnace or water heater which uses a pilot light or any  
device that can create a spark.  
Milwaukee, WI 53201  
General information  
Tune-up specifications  
This is a single cylinder, over-head valve (OHV), air-cooled  
engine.  
Armature air gap is .010-.014 in. (.25-.36 mm)  
Spark plug gap is .030 in. (.76 mm)  
On mobile equipment, this engine will operate satisfactorily at  
any angle at which operator and equipment can function safely.  
Valve clearance is:  
Intake* . . . . . . . . . . . . . . . . . . . . . . .003-.005 in. (.08-.13 mm)  
Exhaust* . . . . . . . . . . . . . . . . . . . . .005-.007 in. (.13-.18 mm)  
Model Series 28E700, 28N700, 287700, 28P700, 28Q700,  
28S700, 28U700  
*
with valve springs installed and piston 1/4 in. (6mm) past  
top dead center.  
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7/16 in. (87.31 mm)  
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1/16 in. (77.78 mm)  
Displacement . . . . . . . . . . . . . . . . . . . 28.42cu. in. (465.7 cc)  
Torque (Max.) . . . . . . . . . . . . . . . . . . 22.9 ft. lbs. @ 2700 rpm  
Model Series 310700, 311700, 312700, 313700  
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9/16 in. (90.60 mm)  
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1/16 in. (77.78 mm)  
Displacement . . . . . . . . . . . . . . . . . . . 30.59 cu. in. (501.2 cc)  
Note: Forpracticaloperation, thehorsepowerloadingshould  
not exceed 85% of rated horsepower. Engine power will  
decrease 3-1/2% for each 1,000 feet (300 meters) above sea  
level and 1% for each 10° F (5.6° C) above 77° F (25° C).  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
9
273683  
Briggs & Stratton Corporation (B&S), the California Air Resources Board (CARB)  
and the United States Environmental Protection Agency (U.S. EPA)  
Emission Control System Warranty Statement (Owner’s Defect Warranty Rights and Obligations)  
Intheinterestoftheenvironment, B&Senginesthatmeetstrictemis-  
sionrequirementsarelabeled, “Thisengineconforms to1995-1998  
California emission regulations for ULGE engines and U.S. EPA  
Phase I regulations for small non-road engines.”  
TO CERTIFIED ENGINES PURCHASED IN CALIFORNIA IN 1995  
AND THEREAFTER, WHICH ARE USED IN CALIFORNIA, AND  
TO CERTIFIED MODEL YEAR 1997 AND LATER ENGINES  
WHICH ARE PURCHASED AND USED ELSEWHERE IN THE  
UNITED STATES.  
EMISSION CONTROL WARRANTY COVERAGE IS APPLICABLE  
California and United States Emission Control Defects Warranty Statement  
CARB, U.S. EPA and B&S are pleased to explain the Emission Con-  
trol System Warranty on your 1996 and later utility or lawn and gar-  
den equipment (ULGE) engine. In California, new ULGE engines  
produced on or after August 1, 1995 must be designed, built and  
equipped to meet the State’s stringent anti-smog standards. Else-  
where in the United States, new non-road, spark-ignition engines  
certified for model year 1997 and later, must meet similar standards  
set forth by the U.S. EPA. B&S must warrant the emission control  
system on your engine for the periods of time listed below, provided  
there has been no abuse, neglect or improper maintenance of your  
ULGE engine.  
Your emission control system includes parts such as the carburetor,  
air cleaner, ignition system, muffler and catalytic converter. Also in-  
cluded may be connectors and other emission related assemblies.  
Whereawarrantableconditionexists, B&SwillrepairyourULGEen-  
gine at no cost to you including diagnosis, parts and labor.  
Briggs & Stratton Emission Control Defects Warranty Coverage  
ULGE engines are warranted relative to emission control parts de-  
fects for a period of two years, subject to provisions set forth below. If  
any covered part on your engine is defective, the part will berepaired  
or replaced by B&S.  
Owner’s Warranty Responsibilities  
As the ULGE engine owner, you are responsible for theperformance  
of the required maintenance listed in your Operator/Owner Manual.  
B&S recommends that you retain all your receipts covering mainte-  
nance on your ULGE engine, but B&S cannot deny warranty solely  
forthelackofreceiptsorforyourfailuretoensuretheperformanceof  
all scheduled maintenance.  
You are responsible for presenting your ULGE engine to an Autho-  
rized B&S Service Dealer as soon as a problem exists. The undis-  
puted warranty repairs should be completed in a reasonable amount  
of time, not to exceed 30 days.  
If you have any questions regarding your warranty rights and re-  
sponsibilities, you should contact a B&S Service Representative at  
1-414-259-5262.  
The emission warranty is a defects warranty. Defects are judged on  
normal engine performance. The warranty is not related to an in-use  
emission test.  
As the ULGE engine owner, you should however be aware that B&S  
may deny you warranty coverage if your ULGE engine or a part has  
failed due to abuse, neglect, improper maintenance or unapproved  
modifications.  
Briggs & Stratton Emission Control Defects Warranty Provisions  
The following are specific provisions relative to your Emission Control Defects Warranty Coverage. It is in addition to the B&S engine warranty  
for non-regulated engines found in the Operator/Owner Manual.  
1. Warranted Parts  
3. No Charge  
Repair or replacement of any Warranted Part will be performed  
Coverageunderthiswarrantyextendsonlytothepartslistedbe-  
low (the emission control systems parts) to the extent these  
parts were present on the engine purchased.  
at no charge to the owner, including diagnostic labor which leads  
to the determination that a Warranted Part is defective, if the  
diagnostic work is performed at an Authorized B&S Service  
Dealer. ForemissionswarrantyservicecontactyournearestAu-  
thorized B&S Service Dealer as listed in the “Yellow Pages” un-  
der “Engines, Gasoline,” “Gasoline Engines,” “Lawn Mowers,”  
or similar category.  
a. Fuel Metering System  
Cold start enrichment system (soft choke)  
Carburetor and internal parts  
Fuel Pump  
4. Claims and Coverage Exclusions  
b. Air Induction System  
Warranty claims shall be filed in accordance with the provisions  
of the B&S Engine Warranty Policy. Warranty coverage shall be  
excluded for failures of Warranted Parts which are not original  
B&S parts or because of abuse, neglect or improper mainte-  
nance as set forth in the B&S Engine Warranty Policy. B&S is not  
liable to cover failures of Warranted Parts caused by the use of  
add-on, non-original, or modified parts.  
Air cleaner  
Intake manifold  
c. Ignition System  
Spark plug(s)  
Magneto ignition system  
5. Maintenance  
d. Catalyst System  
Any Warranted Part which is not scheduled for replacement as  
required maintenance or which is scheduled only for regular in-  
spection to the effect of “repair or replace as necessary” shall be  
warranted as to defects for the warranty period. Any Warranted  
Part which is scheduled for replacement as required mainte-  
nance shall be warranted as to defects only for the period of time  
up to the first scheduled replacement for that part. Any replace-  
ment part that is equivalent in performance and durability may  
be used in the performance of any maintenance or repairs. The  
owner is responsible for the performance of all required mainte-  
nance, as defined in the B&S Operator/Owner Manual.  
Catalytic converter  
Exhaust manifold  
Air injection system or pulse valve  
e. Miscellaneous Items Used in Above Systems  
Vacuum, temperature, position, time sensitive valves  
and switches  
Connectors and assemblies  
2. Length of Coverage  
B&S warrants to the initial owner and each subsequent purchaser  
that the Warranted Parts shall be free from defects in materials  
and workmanship which caused the failure of the Warranted  
Parts for a period of two years from the date the engine is deliv-  
ered to a retail purchaser.  
6. Consequential Coverage  
Coverage hereunder shall extend to the failure of any engine  
components caused by the failure of any Warranted Part still un-  
der warranty.  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
10  
About your engine warranty: (see back cover for statement of LIMITED WARRANTY).  
Briggs & Stratton welcomes warranty repair and apologizes  
to you for being inconvenienced. Any Authorized Service  
Dealer may perform warranty repairs. Most warranty repairs  
are handled routinely, but sometimes requests for warranty  
service may not be appropriate. For example, warranty would  
not apply if engine damage occurred because of misuse, lack  
of routine maintenance, shipping, handling, warehousing or  
improper installation. Similarly, warranty is void if the serial  
number of the engine has been removed or the engine has  
been altered or modified.  
4. Parts which are scored or broken because an engine was  
operated with insufficient or contaminated lubricating oil,  
or an incorrect grade of lubricating oil (check oil level daily  
or after every 8 hours of operation. Refill when necessary  
and change at recommended intervals.) Read “Owner’s  
Manual.”  
5. Repair or adjustment of associated parts or assemblies  
such as clutches, transmissions, remote controls, etc.,  
which are not manufactured by Briggs & Stratton.  
6. Damage or wear to parts caused by dirt, which entered  
the engine because of improper air cleaner maintenance,  
re-assembly, or use of a non-original air cleaner element  
or cartridge. (At recommended intervals, clean and re-oil  
the Oil-Foam element or the foam pre-cleaner, and re-  
place the cartridge.) Read “Owner’s Manual.”  
7. Parts damaged by overspeeding, or overheating caused  
by grass, debris, or dirt, which plugs or clogs the cooling  
fins, or flywheel area, or damage caused by operating the  
engine in a confined area without sufficient ventilation.  
(Clean fins on the cylinder, cylinder head and flywheel at  
recommended intervals.) Read “Owner’s Manual.”  
8. Engine or equipment parts broken by excessive vibration  
caused by a loose engine mounting, loose cutter blades,  
unbalanced blades or loose or unbalanced impellers, im-  
proper attachment of equipment to engine crankshaft,  
overspeeding or other abuse in operation.  
If a customer differs with the decision of the Service Dealer, an  
investigation will be made to determine whether the warranty  
applies. Ask the Service Dealer to submit all supporting facts to  
his Distributor or the Factory for review. If the Distributor or the  
Factory decides that the claim is justified, the customer will be  
fully reimbursed for those items that are defective. To avoid  
misunderstanding which might occur between the customer  
and the Dealer, listed below are some of the causes of engine  
failure that the warranty does not cover.  
Improper maintenance:  
The life of an engine depends upon the conditions under  
whichitoperates, andthecareitreceives. Someapplications,  
such as tillers, pumps and rotary mowers, are very often used  
in dusty or dirty conditions, which can cause what appears to  
be premature wear. Such wear, when caused by dirt, dust,  
spark plug cleaning grit, or other abrasive material that has  
entered the engine because of improper maintenance, is not  
covered by warranty.  
9. A bent or broken crankshaft, caused by striking a solid ob-  
ject with the cutter blade of a rotary lawn mower, or exces-  
sive v-belt tightness.  
10. Routine tune-up or adjustment of the engine.  
11. Engine or engine component failure, i.e., combustion  
chamber, valves, valve seats, valve guides, or burned  
starter motor windings, caused by the use of alternate  
fuels such as, liquified petroleum, natural gas, altered  
gasolines, etc.  
This warranty covers engine related defective material  
and/or workmanship only, and not replacement or refund  
of the equipment to which the engine may be mounted.  
Nor does the warranty extend to repairs required be-  
cause of:  
1. PROBLEMS CAUSED BY PARTS THAT ARE NOT  
ORIGINAL BRIGGS & STRATTON PARTS.  
2. Equipment controls or installations that prevent starting,  
cause unsatisfactory engine performance, or shorten en-  
gine life. (Contact equipment manufacturer.)  
Warranty is available only through service dealers which  
have been authorized by Briggs & Stratton Corporation.  
Your nearest Authorized Service Dealer is listed in the  
“Yellow Pages ” of your telephone directory under “En-  
gines, Gasoline” or “Gasoline Engines,” “Lawn Mow-  
ers,” or similar category.  
3. Leaking carburetors, clogged fuel pipes, sticking valves,  
or other damage, caused by using contaminated or stale  
fuel. (Use clean, fresh, lead-free gasoline and Briggs &  
Stratton gasoline stabilizer, Part No. 5041.)  
Briggs & Stratton Engines Are Made Under One Or More Of The Following Patents: Design D-247,177 (Other Patents Pending)  
5,642,701  
5,606,948  
5,548,955  
5,546,901  
5,503,125  
5,497,679  
5,320,795  
5,271,363  
5,269,713  
5,265,700  
5,243,878  
5,235,943  
5,197,425  
5,197,422  
5,191,864  
5,188,069  
5,186,142  
5,138,996  
5,105,331  
5,086,890  
5,070,829  
5,058,544  
5,040,644  
5,040,503  
5,009,208  
4,996,956  
4,995,357  
4,977,879  
4,971,219  
4,895,119  
4,875,448  
4,819,593  
4,719,682  
4,694,792  
4,633,556  
4,630,498  
4,522,080  
4,520,288  
4,453,507  
4,430,984  
4,355,253  
4,270,509  
DES. 309,458  
DES. 309,457  
DES. 308,872  
DES. 308,871  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
11  
BRIGGS & STRATTON ENGINE OWNER WARRANTY POLICY  
effective July 1, 1998  
Replaces all undated Warranties and all Warranties  
dated before July 1, 1998  
LIMITED WARRANTY  
“Briggs & Stratton Corporation will repair or replace, free of charge, any part, or parts of the engine that are defective in  
material or workmanship or both. Transportation charges on parts submitted for repair or replacement under this Warranty  
must be borne by purchaser. This warranty is effective for the time periods and subject to the conditions provided for in this  
policy. ForwarrantyservicecontactyournearestAuthorizedServiceDealeraslistedintheYellowPages underEngines,  
Gasoline,’ ‘Gasoline Engines,’ ‘Lawn Mowers’ or similar category. THERE IS NO OTHER EXPRESS WARRANTY. IM-  
PLIED WARRANTIES, INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  
ARE LIMITED TO ONE YEAR FROM PURCHASE, OR TO THE EXTENT PERMITTED BY LAW ANY AND ALL IMPLIED  
WARRANTIESARE EXCLUDED. LIABILITY FOR CONSEQUENTIAL DAMAGES UNDER ANY AND ALL WARRANTIES  
ARE EXCLUDED TO THE EXTENT EXCLUSION IS PERMITTED BY LAW. Some states do not allow limitations on how  
long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or consequential dam-  
ages, so the above limitation and exclusion may not apply to you. This warranty gives you specific legal rights and you may  
also have other rights which vary from state to state.”  
Briggs & Stratton Corporation  
F. P. Stratton, Jr.  
Chairman and Chief Executive Officer  
WARRANTY PERIOD  
WITHIN U.S.A. AND CANADA  
OUTSIDE U.S.A. AND CANADA  
CONSUMER  
COMMERCIAL  
CONSUMER  
COMMERCIAL  
ENGINES  
USE*  
USE*  
USE*  
USE*  
All Vanguard engines.  
2 year – engine } / Lifetime** – Magnetron ignition  
All Diamond Plus , Industrial Plus , I/C  
engines and sleeve bore Intek series.  
2 year  
2 year  
1 year  
2 year }  
1 year  
Quantum and Diamond Power .  
90 days  
{2 year {  
}
90 days  
All standard engines and Kool Bore Intek series  
installed on lawn mowers, riders, edgers,  
chippers, shredders, tillers, fun carts, and all  
Sno/Gard engines.  
2 year  
1 year  
90 days  
90 days  
1 year  
1 year  
90 days  
90 days  
All other standard engines and Classic series.  
*
For purposes of this warranty policy, “consumer use” means personal residential household use by the original retail consumer.  
“Commercial use” means all other uses, including use for commercial, income producing or rental purposes. Once an engine  
has experienced commercial use, it shall thereafter be considered as a commercial use engine for purposes of this warranty.  
Engines used in competitive racing or on commercial or rental tracks are not warrantied.  
** Lifetime limited warranty of the Magnetron ignition covers parts and labor for the first five (5) years from the date of purchase;  
thereafter only parts. “Lifetime” means lifetime of the engine in the hands of the original purchaser.  
{
}
One (1) year in Australia, New Zealand, Middle East and Africa.  
One (1) year in India.  
NO WARRANTY REGISTRATION CARD IS NECESSARY TO OBTAIN WARRANTY ON BRIGGS & STRATTON ENGINES.  
YOU MUST SAVE THE PURCHASE RECEIPT. A PROOF OF PURCHASE DATE WILL BE REQUIRED TO OBTAIN WARRANTY.  
In the USA and Canada, a 24 hour hot line, 1-800-233-3723, has a menu of pre-recorded messages offering you engine maintenance information.  
12  

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