Briggs & Stratton 120000 Operating instructions

POST OFFICE BOX 702

MILWAUKEE, WI 53201 USA

BRIGGS&STRATTON

CORPORATION

Part No. 279000 -3/11

110000/120000 Professional Series™

Single Cylinder Engines

Service, Troubleshooting, and Repair Manual

277527 Single Cylinder DOV ®Air-Cooled Engines

273521 Twin Cylinder OHV Air-Cooled Engines

276781 Single Cylinder OHV Air-Cooled Engines

271172 Twin Cylinder “L” Head Air-Cooled Engines

270962 Single Cylinder “L” Head Air-Cooled Engines

276535 Two-Cycle Snow Engines

CE8069 Out of Production Engines (1919-1981)

Repair Manuals for other

Briggs & Stratton Engines:

Quality Starts With A

Master Service Technician

www.ThePowerPortal.com (Dealers)

BRIGGSandSTRATTON.COM (Consumers)

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for

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FORWARD

This manual was written to assist engine technicians and service personnel with the repair and

maintenance procedures for Briggs & Stratton® engines. It assumes that persons using this manual have

been properly trained in and are familiar with the servicing procedures for these products, including the

proper use of required tools and safety equipment and the application of appropriate safety practices.

Persons untrained or unfamiliar with these procedures or products should not attempt to perform such

work.

Proper maintenance and repair is important to safe, reliable operation of all engines and engine-driven

systems. The troubleshooting, testing, maintenance, and repair procedures described in this manual are

appropriate for the Briggs & Stratton® engines described herein. Alternative methods or procedures may

pose risk to personal safety and the safety and/or reliability of the engine and are not endorsed or

recommended by Briggs & Stratton.

All information, illustrations, and specifications contained in this manual were based on the data available

at the time of publication. Briggs & Stratton Corporation reserves the right to change, alter, or otherwise

improve the product or the product manuals at any time without prior notice.

Briggs & Stratton offers two complementary publications to enhance understanding of engine technology,

maintenance, and repair. (Neither publication, however, is a substitution for a recognized training program

for engine technicians.)

• For consumers, Small Engine Care & Repair (p/n 274041) provides a comprehensive overview of how

small air-cooled engines work, basic troubleshooting, and step-by-step maintenance procedures.

• For engine technicians and consumers alike, an in-depth study of engine theory and operation can be

found in the textbook Small Engines (p/n CE8020).

Both publications can be purchased at BRIGGSandSTRATTON.COM or through a local Authorized Briggs

& Stratton Service Dealer.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying or recording by any information storage and retrieval system, without

prior written permission from Briggs & Stratton Corporation.

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This engine repair manual includes the following

engine models:

• MODEL 110000

• MODEL 120000

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SECTION 1 - Safety, Maintenance and Adjustments

SECTION 2 - Troubleshooting

SECTION 3 - Exhaust Systems

SECTION 5 - Governor Systems

SECTION 6 - Cylinder Heads and Valves

SECTION 7 - Starters

SECTION 8 - Lubrication Systems

SECTION 9 - Cylinders, Covers and Sumps

SECTION 10 - Crankshafts, Camshafts, Balancing Systems and Gear Reductions

SECTION 11 - Pistons, Rings and Connecting Rods

SECTION 12 - Engine Specifications

SECTION 4 - Fuel Systems and Carburetion

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SECTION 1 - SAFETY, MAINTENANCE AND ADJUSTMENTS

SAFETY INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

ENGINE MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

FUEL AND OIL RECOMMENDATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

MAINTENANCE CHART - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

OIL CHANGE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

AIR FILTER - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

SPARK PLUG - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

COOLING SYSTEM - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

CHARGING BATTERY- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

COMBUSTION CHAMBER- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

ENGINE ADJUSTMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -11

THROTTLE CABLE ADJUSTMENT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

GOVERNOR ADJUSTMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

ADJUST VALVE CLEARANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

ADJUST READYSTART® CHOKE LINK - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

ADJUST ARMATURE AIR GAP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

ADJUST ALTERNATOR AIR GAP - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

FLYWHEEL BRAKE- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

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SAFETY INFORMATION

This repair manual contains safety information

that is designed to:

• Make you aware of hazards associated

with engines.

• Inform you of the risk of injury associated

with those hazards.

• Tell you how to avoid or reduce the risk of

injury.

Signal Words in Safety Messages

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, could result in minor or

moderate injury.

NOTICE indicates a situation that could

result in damage to the product.

Prior to work, read and understand the section(s)

of this manual that pertain to the job. Follow all

safety warnings.

• Always use fresh gasoline. Stale fuel can

cause gum deposits in the carburetor

and cause leakage, flow restrictions, or

other problems.

• Check fuel lines and fittings frequently for

cracks or leaks and replace if necessary.

Hazard Symbols and Meanings

WARNING

Before attempting to service this equipment,

read and understand this manual and the

operating instructions of the engine and the

equipment it powers.

Failure to follow instructions could result in

property damage, serious injury (including

paralysis) or even death.

FIRE EXPLOSION ELECTRIC

SHOCK

EXPLOSIVE

PRESSURE

HOT

SURFACE GOGGLES

ENTANGLEMENT KICKBACK AMPUTATION

TOXIC

FUMES

READ

MANUAL

CHEMICAL

BURNS

WARNING

Battery posts, terminals, and related accesso-

ries contain lead and lead compounds - chem-

icals known to the State of California to cause

cancer and reproductive harm. Wash hands

after handling.

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WARNING

Certain components in this product and its

related accessories contain chemicals known

to the State of California to cause cancer, birth

defects, or other reproductive harm. Wash

hands after handling.

WARNING

Briggs & Stratton Engines are not designed for and

are not to be used to power: fun-karts; go-karts;

children’s, recreational or sport all-terrain vehicles

(ATVs); motorbikes; hovercraft; aircraft products; or

vehicles used in competitive events not sanctioned

by Briggs & Stratton. For information about

competitive racing products, see

www.briggsracing.com. For use with utiity and side-

by-side ATVs, please contact Briggs & Stratton

Engine Application Center, 1-866-927-3349.

Improper engine application may result in serious

injury or death.

WARNING

The engine exhaust from this product contains

chemicals known the State of California to

cause cancer, birth defects, and other repro-

ductive harm.

WARNING

Running engines produce heat.

Severe burns can occur on contact.

• Allow muffler, engine cylinder fins, and radiator

to cool before touching.

• Remove accumulated combustibles from muf-

fler area and cylinder area.

• It is a violation of California Public Resource

Code, Section 4442, to use or operate the

engine on any forest-covered, brush-covered,

or grass-covered land unless the exhaust sys-

tem is equipped with a spark arrester, as

defined in Section 4442, maintained in effective

working order. Other States and Federal juris-

dictions may have similar laws. Contact the

original equipment manufacturer, retailer, or

dealer to obtain spark arrester designed for the

exhaust system installed on this engine.

WARNING

Fuel and its vapors are extremely flam-

mable and explosive.

Fire or explosion can cause severe

burns or death.

When adding fuel:

• Turn engine OFF and let engine cool for at

least 2 minutes before removing the fuel

cap.

• Fill fuel tank outdoors or in a well-venti-

lated area.

• Do not overfill fuel tank. To allow for

expansion of the gasoline, do not fill above

the bottom of the fuel tank neck.

• Keep gasoline away from sparks, open

flames, pilot lights, heat and other ignition

sources.

• Check fuel lines, tank, cap, and fittings fre-

quently for cracks or leaks. Replace if nec-

essary.

• If fuel spills, wait until it evaporates before

starting engine.

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 (if equipped) to

OPEN/RUN position. Place throttle (if

equipped) in FAST and crank until engine

starts.

When operating equipment:

• Do not tip engine or equipment at an

angle which would cause fuel to spill.

• Do not choke carburetor to stop engine.

• Never start or run the engine with the air

cleaner assembly (if equipped) or the air

filter (if equipped) removed.

When changing oil:

• If you drain the oil from the top oil fill tube,

the fuel tank must be empty or fuel can

leak out and result in a fire or explosion.

When transporting equipment:

• Transport with fuel tank empty or with fuel

shut-off valve set to OFF.

When storing gasoline or equipment with

fuel in the tank:

• Store away from furnaces, stoves, water

heaters, or other appliances that have a

pilot light or other ignition source because

they can ignite gasoline vapors.

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