Briggs & Stratton 12C700 Series Installation and operation manual

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Model Series

Covered in

This Manual

12C700

12C800

12F700

12F800

12G700

12G800

12H700

12H800

12J700

12J800

12N800

12P800

12T700

12T800

12U800

12V800

12W800

127700

127800

128700

128800

129700

129800

Operating & Maintenance

Instructions

Model Type Code

Month Day Year

Note: General Model Series numbers noted above include many specific numbers

like the ones on your engine. To get replacement parts or technical assistance in

the future, write your engine Model, Type, Code and date of purchase here.

TABLE OF CONTENTS

Safety 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine Information 6. . . . . . . . . . . . . . . . . . . . . . . .

Oil 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuel and Starting Information 8. . . . . . . . . . . . . . .

Starting and Stopping 9-10. . . . . . . . . . . . . . . . . . .

Maintenance 11-13. . . . . . . . . . . . . . . . . . . . . . . . .

Adjustments 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts and Service & Storage 15-16. . . . . . . . . . . .

Warranty Information 17. . . . . . . . . . . . . . . . . . . . .

WARNING

Briggs & Stratton does not approve or authorize the use of

these engines on 3-wheel All Terrain Vehicles (ATVs), motor

bikes, aircraft products or vehicles intended for use in

competitive events. Use of these engines in such applications

could result in property damage, serious injury (including

paralysis), or even death.

In the USA and Canada our 24 hour hotline is

1-800-233-3723

Briggs & Stratton Corporation

Milwaukee, Wisconsin 53201

www.briggsandstratton.com

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THE POWER IN POWER EQUIPMENT

Thank you for selecting a Briggs & Stratton engine to power your equipment.

Briggs & Stratton is committed to producing a line of engines which will make your life’s chores easier to

perform. We have, at the same time, improved the design of our engines so they are environmentally

friendly. Since 1995, we have succeeded in reducing smog-forming exhaust emissions from our engines

by 70%. Briggs & Stratton’s efforts have not stopped there. We are also committed to designing and

introducing even cleaner engines in the future, while maintaining our reputation for excellent utility and

value.

Briggs & Stratton’s environmental awareness has resulted in the engineering of the “Smart-Fill” gas

can, featuring a spill resistant nozzle which opens only when fully inserted into the gas tank, and which

shuts off automatically when the tank is full. Because refueling spills can harm the environment, the

Smart-Fillcontainer helps preserve a stronger ecosystem by reducing this source of pollution.

We hope you will enjoy your new engine and equipment. We welcome you to our worldwide family of

Briggs & Stratton engine users.

Best Wishes Always,

The Employees of Briggs & Stratton Corporation

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BEFORE OPERATING ENGINE

•Read entire Operating & Maintenance Instructions AND

the instructions for the equipment this engine powers.*

•Failure to follow instructions could result in serious injury

or death.

THE OPERATING & MAINTENANCE INSTRUCTIONS

CONTAIN SAFETY INFORMATION TO

•Make you aware of hazards associated with engines

•Inform you of the risk of injury associated with those hazards, and

•Tell you how to avoid or reduce the risk of injury.

274265

The safety alert symbol ( )is used to identify safety

information about hazards that can result in personal injury.

A signal word (DANGER, WARNING, or CAUTION) is

used with the alert symbol to indicate the likelihood and the

potential severity of injury. In addition, a hazard symbol

may be used to represent the type of hazard.

DANGER indicates a hazard which, if not

avoided, will result in death or serious injury.

WARNING indicates a hazard which, if not

avoided,could result in death or serious injury.

CAUTION indicates a hazard which, if not

avoided, might result in minor or moderate

injury.

CAUTION,when used without the alert symbol,

indicates a situation that could result in damage

to the engine.

HAZARD SYMBOLS AND MEANINGS

Explosion

Toxic Fumes

Moving Parts

Shock

Hot Surface

Kickback

Fire

WARNING

The engine exhaust from this prod-

uct contains chemicals known to the

State of California to cause cancer,

birth defects, or other reproductive

harm.

* Briggs & Stratton does not necessarily know what equipment this engine will power. For that reason, you should carefully

read and understand the operating instructions for the equipment on which your engine is placed.

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SAFETY

WARNING

Gasoline and its vapors are extremely flammable

and explosive.

Fire or explosion can cause severe burns or death.

WHEN ADDING FUEL

•Turn engine OFF and let engine cool at least 2

minutes before removing gas cap.

•Fill fuel tank outdoors or in well-ventilated area.

•Do not overfill fuel tank. Fill tank to approximately

1-1/2 inches below top of neck to allow for fuel

expansion.

•Keep gasoline away from sparks, open flames,

pilot lights, heat, and other ignition sources.

•Check fuel lines, tank, cap, and fittings frequently

for cracks or leaks. Replace if necessary.

WHEN STARTING ENGINE

•Make sure spark plug, muffler, fuel cap and air

cleaner are in place.

•Do not crank engine with spark plug removed.

•If fuel spills, wait until it evaporates before starting

engine.

•If engine floods, set choke to OPEN/RUN position,

place throttle in FAST and crank until engine starts.

WHEN OPERATING EQUIPMENT

•Do not tip engine or equipment at angle which

causes gasoline to spill.

•Do not choke carburetor to stop engine.

WHEN TRANSPORTING EQUIPMENT

•Transport with fuel tank EMPTY or with fuel shut-off

valve OFF.

WHEN STORING GASOLINE OR EQUIPMENT

WITH FUEL IN TANK

•Store away from furnaces, stoves, water heaters or

other appliances that have pilot light or other

ignition source because they can ignite gasoline

vapors.

WARNING

Unintentional sparking can result in fire or electric

shock.

Unintentional start-up can result in entanglement,

traumatic amputation, or laceration.

BEFORE PERFORMING ADJUSTMENTS OR

REPAIRS

•Disconnect spark plug wire and keep it away from

spark plug.

•Disconnect battery at negative terminal (only

engines with electric start).

WHEN TESTING FOR SPARK

•Use approved spark plug tester.

•Do not check for spark with spark plug removed.

WARNING

Starting engine creates sparking.

Sparking can ignite nearby flammable gases.

Explosion and fire could result.

•If there is natural or LP gas leakage in area, do not

start engine.

•Do not use pressurized starting fluids because

vapors are flammable.

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SAFETY

WARNING

Engines give off carbon monoxide, an odorless,

colorless, poison gas.

Breathing carbon monoxide can cause nausea,

fainting or death.

•Start and run engine outdoors.

•Do not start or run engine in enclosed area, even if

doors or windows are open.

WARNING

Running engines produce heat. Engine parts,

especially muffler, become extremely hot.

Severe thermal burns can occur on contact.

Combustible debris, such as leaves, grass, brush,

etc. can catch fire.

•Allow muffler, engine cylinder and fins to cool

before touching.

•Remove accumulated combustibles from muffler

area and cylinder area.

•Install and maintain in working order a spark

arrester before using equipment on forest-covered,

grass-covered, brush-covered unimproved land.

The state of California requires this (Section 4442

of the California Public Resources Code). Other

states may have similar laws. Federal laws apply

on federal land.

WARNING

Rotating parts can contact or entangle hands, feet,

hair, clothing, or accessories.

Traumatic amputation or severe laceration can

result.

•Operate equipment with guards in place.

•Keep hands and feet away from rotating parts.

•Tie up long hair and remove jewelry.

•Do not wear loose-fitting clothing, dangling

drawstrings or items that could become caught.

WARNING

Rapid retraction of starter cord (kickback) will pull hand

and arm toward engine faster than you can let go.

Broken bones, fractures, bruises or sprains could

result.

•When starting engine, pull cord slowly until

resistance is felt, then pull rapidly.

•Remove all external equipment/engine loads

before starting engine.

•Direct coupled equipment components such as,

but not limited to, blades, impellors, pulleys,

sprockets, etc., must be securely attached.

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ENGINE PARTS

1. Primer bulb (if equipped)

2. Carburetor

3. Spark plug wire

4. Cylinder area

5. Muffler/(Muffler guard, if equipped)/

(Spark arrester, if equipped)

6. Flywheel brake

7. Engine Model Type Code

xxxxx xxxx xx xxxxxxxx

8. Oil fill/Dipstick

9. Fuel tank

10. Air cleaner

11. Fuel fill

12. Finger guard

13. Rope handle

14. Side drain plug (if equipped)

12 11

GENERAL INFORMATION

ENGINE MODEL

This is a single cylinder, L-head, air-cooled engine. It is a

low emissions engine.

MODEL SERIES 120000

Bore 2-11/16 in. (68.26 mm). . . . . . . . . . . . . . . . . . . . . . . . .

Stroke 2-3/64 in. (51.99 mm). . . . . . . . . . . . . . . . . . . . . . . .

Displacement 11.57 cu. in. (189.6 cc). . . . . . . . . . . . . . . . .

Note: For practical operation, the horsepower loading

should 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). It will operate satisfactorily at an angle up to 15°.

TUNE-UP SPECIFICATIONS

Armature air gap 0.006 –0.010 in. (0.15 –0.25 mm). . .

Spark plug gap 0.030 in. (0.76 mm). . . . . . . . . . . . . . . . . .

Valve clearance with valve springs installed and piston 1/4 in.

(6 mm) past top dead center (check when engine is cold).

See Repair Manual P/N 270962.

Intake 0.005 –0.007 in. (0.13 –0.18 mm). . . . . . . . . . . . .

Exhaust 0.007 –0.009 in. (0.18 –0.23 mm). . . . . . . . . . .

THE INTERNATIONAL SYMBOLS USED

ON THE ENGINE OR

IN THIS MANUAL INCLUDE:

On Off

Fuel Shutoff

Read Owner’s

Manual

Stop

Fuel

Choke

Safety Alert

Oil

Primer

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OIL

274265

CAUTION: This engine is shipped from Briggs &

Stratton without oil. Check oil level before starting

engine. If you start the engine without oil, the engine

will be damaged beyond repair and will not be

covered under warranty.

OIL CAPACITY

Engine holds approximately 5/8 quart (20 ounces; 0.6 liter).

TYPE OF OIL TO USE

•Use a high quality detergent oil classified “For Service

SF, SG, SH, SJ”or higher, such as Briggs & Stratton

30W, Part Number 100005 (20 oz) or 100028 (48 oz).

•Do not use special additives.

•Choose a viscosity according to the table opposite.

Note: Synthetic oil meeting ILSAC GF-2, API

certification mark and API service symbol

(shown at left) with “SJ/CF ENERGY CON-

SERVING”or higher, is an acceptable oil at all

temperatures. Use of synthetic oil does not

alter required oil change intervals.

°F-20 0 20 40 60 80 100

°C-30 -20 -10 0 10 20 30 40

STARTING TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE

*CAUTION: Air cooled engines run hotter than

automotive engines. The use of non-synthetic

multi-viscosity oils (5W-30, 10W-30, etc.) in

temperatures above 40°F (4°C) will result in higher

than normal oil consumption. When using a

multi-viscosity oil, check oil level more frequently.

** CAUTION: SAE 30 oil, if used below 40°F (4°C), will

result in hard starting and possible engine bore

damage due to inadequate lubrication.

SAE Viscosity Grades

CHECKING AND ADDING OIL

•Check oil level before starting the engine.

•Check level daily, or after every eight (8) hours.

•Keep oil level at FULL.

CAUTION:Do not overfill. Overfilling with oil may cause:

Smoking,

Hard starting,

Spark plug fouling, or

Oil saturation of air filter.

[1] Place engine level and

clean around oil fill area. [2] Remove dipstick and

wipe clean with cloth. [3] Replace and tighten dip-

stick. Remove and check

oil level.

Oil Fill

[4] Oil level should be at

FULL line on dipstick. [5] If needed, add oil slowly -

recheck. Do not over fill. [6] Replace and tighten dip-

stick.

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FUEL

TYPE OF FUEL TO USE

•Use clean, fresh, regular unleaded gasoline with a

minimum of 77 octane. Fresh fuel prevents gum from

forming in the fuel system or onessential carburetor parts.

Purchase fuel in quantity that can be used within 30 days.

•Do not use gasoline which contains Methanol.

•Do not mix oil with gasoline.

•For engine protection use Briggs & Stratton Gasoline

Additive available from your Authorized Briggs &

Stratton Dealer (P/N 5041 or single use pouch).

•This engine is certified to operate on gasoline. Exhaust

Emission Control System: EM (Engine Modifications).

CAUTION: Some fuels, called oxygenated or reformu-

lated gasoline, are gasoline blended with alcohols or

ethers. Excessive amounts of these blends can damage

the fuel system or cause performance problems. If any

undesirable operating symptoms occur, use gasoline

with a lower percentage of alcohol or ether.

ADDING FUEL

WARNING

Note: Remove and discard blue plug in fuel fill.

[1] Fill fuel tank outdoors or in well-ventilated area,

away from sparks, open flames, pilot lights, heat,

and other ignition sources.

[2] If fuel spills, wait until it evaporates before starting

engine.

[3] Turn engine OFF and let engine cool at least 2

minutes before removing gas cap.

[4] Remove cap. Fill tank to approximately 1-1/2 inches

below top of neck to allow for fuel expansion. Be

careful not to overfill.

Briggs & Stratton Smart-fillfuel can fills to the

correct level and automatically shuts off, reducing

spills and emissions.

[5] Replace cap before starting.

Fuel Fill

STARTING

WARNING

•Do not use pressurized starting fluids.

•Vapors are flammable.

•Smoking,

•Hard starting,

•Spark plug fouling,

•Oil saturation of air filter.

CAUTION

If engine is tipped to transport equipment, remove grass,

drain oil, etc., keep spark plug side of engine up.

Tipping engine with spark plug down may cause:

KEEP SPARK PLUG UP

STARTING AND OPERATING TIPS

♦Store and fuel equipment in level position.

♦Use fresh fuel. (See Fuel.)

♦Use correct type of oil for expected starting

temperature. (See Oil.)

♦Remove external equipment/engine loads. (See

equipment operating instructions.)

♦Start lawn mower on hard surface or over previously

cut grass.

♦Periodically remove grass buildup under mower

deck. (See Maintenance.)

♦After engine has started, let it warm up several

seconds to several minutes, depending on outside

temperature.

♦For maximum performance and life, operate engine

with choke (if equipped) in RUN and throttle in FAST.

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STARTING AND STOPPING

REWIND (MANUAL) STARTER

TO START ENGINE

[1] Check oil level (see p. 7).

[2] Open fuel shut-off valve

(if equipped) 1/4 turn.

[3] Move throttle (if equipped) to FAST.

Operate engine with throttle in FAST.

[4] Push stop switch (if equipped) to ON.

[5] Firmly push primer bulb 3

times OR move choke

control lever to CHOKE

position.

Primer Choke

[6] Close safety brake

handle on lawn mowers

and any other equipment

with this feature. [7] Grasp rope handle. Pull

slowly until resistance is

felt, then pull rapidly to

start engine and avoid

kickback.

[8] Let engine warm up.

Choke Equipped: Move

choke control lever

toward RUN a short dis-

tance at a time over sev-

eral seconds in warm

weather or minutes in cold

weather. Let engine run

smoothly before each

change. Operate with

choke in RUN.

WARNING

TO STOP ENGINE

CAUTION: Do not stop engine by moving choke

control to CHOKE. Backfire, fire or engine damage

could occur.

[1] Move throttle (if equipped) to

SLOW, then release safety

brake control handle. [2] Move throttle (if equipped)

to SLOW, then to STOP.

[3] Push stop switch (if equipped) to OFF.

[4] Close fuel shut-off valve (if

equipped).

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STARTING AND STOPPING

ELECTRIC (KEY) STARTER (if equipped)

TO START ENGINE

[1] Check oil level (see p. 7).

[2] Open fuel shut-off valve

(if equipped) 1/4 turn.

[3] Move throttle (if

equipped) to FAST.

[4] Operate engine with

throttle in FAST position.

[5] Firmly push primer bulb

3 times OR move choke

control lever to CHOKE

position.

Primer Choke

[6] Close safety brake

handle on lawn mowers

and any other equipment

with this feature.

CAUTION: To prolong starter life, use short

starting cycles (5 seconds maximum, then wait

one minute). Follow equipment manufacturer’s

recommendations for charging battery.

[7] Insert key and turn to

START.

[8] Let engine warm up.

Choke Equipped: Move

choke control lever

toward RUN a short dis-

tance at a time over sev-

eral seconds in warm

weather or minutes in

cold weather. Let engine

run smoothly before each

change. Operate with

choke in RUN.

TO STOP ENGINE

[1] Move throttle (if equipped) to

SLOW, then release safety

brake control handle. [2] Move throttle (if equipped)

to SLOW.

[3] Turn key to OFF. Remove key and

store out of reach of children.

[4] Close fuel shut-off valve (if

equipped).

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