Briggs & Stratton 120000 Manual

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Model Series
Covered in
This Manual
110000
120000
200000
210000
Operating & Maintenance
Instructions
Model Type Code
Month Day Year
Note: General Model Series numbers noted above are inclusive of the specific model
number found 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 11-14. . . . . . . . . . . . . . . . . . . . . . . . .
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, fun/recreational go-karts, 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.
Need assistance? Go to www.briggsandstratton.com
for detailed information regarding Briggs & Stratton engines.
Or call, 1-800-233-3723, (U.S.A. and Canada)
to hear a menu of pre-recorded messages
offering engine maintenance information.
PRINTED IN U.S.A. ©Copyright 2005 by Briggs & Stratton Corporation FORM NO. 275092-8/05

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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.
275092
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.
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.
HAZARD SYMBOLS AND MEANINGS
Explosion
Toxic Fumes
Moving Parts
ShockHot Surface
Kickback
Fire
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
*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
Gasoline and its vapors are extremely
flammable and explosive.
Fire or explosion can cause severe burns
or death.
WARNING
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.
Starting engine creates sparking.
Sparking can ignite nearby flammable
gases.
Explosion and fire could result.
WARNING
•If there is natural or LP gas leakage in area, do not
start engine.
•Do not use pressurized starting fluids because
vapors are flammable.
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.
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.

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SAFETY
Engines give off carbon monoxide, an
odorless, colorless, poison gas.
Breathing carbon monoxide can cause
nausea, fainting or death.
WARNING
•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

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ENGINE INFORMATION
1. Spark plug
2. Air cleaner
3. Choke
4. Carburetor
5. Fuel shut-off valve
(if equipped)
6. Rope handle
7. Finger guard
8. Stop switch/OIL GARD®light
(if equipped)
9. Fuel fill
10. Fuel tank
11. Oil fill/Dipstick
(if equipped)
12. Blower housing
13. Oil drain plug
14. Oil fill cap
15. Engine Model Type Code
xxxxx xxxx xx xxxxxxxx
16. Muffler/(Muffler guard, if equipped)/
(Spark arrester, if equipped)
1
2
3
4
5
6
8
13
11
12
10
14
16
7
9
15
GENERAL INFORMATION
ENGINE MODEL
This is a single cylinder, overhead valve (OHV), air-cooled
engine. It is a low emissions engine.
In the state of California, OHV Model Series 110000 and
120000 engines are certified by the California Air Re-
sources Board to meet emissions standards for 125 hours.
OHV Model Series 200000, 210000 engines are certified
by the California Air Resources Board to meet emissions
standards for 250 hours. Such certification does not grant
the purchaser, owner or operator of this engine any
additional warranties with respect to the performance or
operational life of this engine. This engine is warranted
solely according to the product and emissions warranties
stated elsewhere in this manual.
Note: For practical operation, horsepower loading should
not exceed 85% of rated horsepower. Engine power will de-
crease 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).
Engine will operate satisfactorily at an angle up to 15°.
MODEL SERIES 110000
Bore 2-11/16 in. (68 mm). . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2-3/64 in. (52 mm). . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 11.58 cu. in. (190 cc). . . . . . . . . . . . . . . . . .
MODEL SERIES 120000
Bore 2-11/16 in. (68 mm). . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2-13/64 in. (56 mm). . . . . . . . . . . . . . . . . . . . . . . . .
Displacement 12.48 cu. in. (206 cc). . . . . . . . . . . . . . . . . .
MODEL SERIES 200000
Bore 3.120 in. (79.23 mm). . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2.438 in. (61.67 mm). . . . . . . . . . . . . . . . . . . . . . . .
Displacement 18.64 cu. in. (305 cc). . . . . . . . . . . . . . . . . .
MODEL SERIES 210000
Bore 3.300 in. (83.81 mm). . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke 2.438 in. (61.67 mm). . . . . . . . . . . . . . . . . . . . . . . .
Displacement 20.85 cu. in. (342 cc). . . . . . . . . . . . . . . . . .
TUNE-UP SPECIFICATIONS
Models 110000/120000
Armature air gap 0.010 – 0.014 in. (0.25 – 0.36 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 272147.
Intake 0.004 – 0.006 in. (0.10 – 0.15 mm). . . . . . . . . . . . .
Exhaust 0.009 – 0.011 in. (0.23 – 0.28 mm). . . . . . . . . . .
TUNE-UP SPECIFICATIONS
Models 200000/210000
Armature air gap 0.008 – 0.012 in. (0.20 – 0.30 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 272147.
Intake 0.004 – 0.006 in. (0.10 – 0.15 mm). . . . . . . . . . . . .
Exhaust 0.004 – 0.006 in. (0.10 – 0.15 mm). . . . . . . . . . .

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OIL
275092
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.
Note: If this engine is equipped with gear reduction, gear
reduction case must be filled with oil prior to operating en-
gine. See gear reduction oil filling instructions on page 12.
OIL CAPACITY
Model 110000 and 120000 series engines hold approxi-
mately 5/8 quart (20 ounces; 0.6 liter).
Model series 200000 and 210000 engines hold approxi-
mately 7/8 quart (28 ounces; 0.8 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
SAE 30, 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
*
**
32
*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.
•Do not overfill.
[1] Place engine level and
clean around oil fill area.
[2] Remove dipstick and wipe with clean
cloth. Replace and tighten dipstick.
Remove and check oil level.
High
Oil Fill
(if equipped)
FULL
[3] Pour oil slowly. Fill to FULL line on
dipstick – recheck.
[4] Replace and tighten dipstick.
[1] Place engine level and
clean around oil fill area.
[2] Remove oil fill
cap or dipstick.
Low
Oil Fill
OIL LEVEL
[3] Pour oil slowly. Fill to
point of overflowing.
[4] Replace and tighten
oil fill cap.

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OIL
CHECKING AND ADDING OIL
[1] Remove dipstick
and wipe with
clean cloth.
Low
Oil Fill
with Dipstick
[2] Insert dipstick,
but DO NOT
TIGHTEN.
Remove and
check oil level.
[3] Pour oil slowly.
Fill to FULL
mark on dip-
stick. Replace
and tighten dip-
stick.
FULL OIL
LEVEL
FUEL
TYPE OF FUEL TO USE
•Use clean, fresh, regular unleaded gasoline with a
minimum of 85 octane. Fresh fuel prevents gum from
forming in the fuel system or on essential 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
Fuel Fill
WARNING
[1] 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, reduc-
ing spills and emissions.
[2] Replace cap before starting.
•Turn engine OFF and let engine cool at least 2
minutes before removing gas cap.
•Fill fuel tank outdoors or in well-ventilated area.
•Keep gasoline away from sparks, open flames,
pilot lights, heat, and other ignition sources.
•If fuel spills, wait until it evaporates before
starting engine.
STARTING
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.)
♦Periodically remove any debris buildup from the
machine (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 in RUN and throttle in FAST.

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STARTING AND STOPPING
WARNING
•Do not use pressurized starting fluids.
•Vapors are flammable.
CAUTION: Some engines may be equipped with OIL
GARD®. The OIL GARD®is intended to warn the
operator that the engine is low on oil. Always check oil
level before starting. Engine damage may occur if the oil
level is not properly maintained and will void warranty
coverage. If the engine will not start, has stopped running
and/or a light flickers in the stop switch, add oil (see
instructions).
REWIND (MANUAL) STARTER
TO START ENGINE
[1] Check oil level (see p. 7).
[2] Turn fuel shut-off valve (if equipped) 1/4 turn
to OPEN.
[3] Push choke lever to CHOKE position.
[4] Move throttle (if
equipped) to FAST.
Operate engine with
throttle in FAST.
Fuel shut-off Choke
OIL
LEVEL
FULL
OPEN
POSITION
[5] Push rocker switch
(if equipped) to ON. [6] Grasp rope handle. Pull slowly until
resistance is felt, then pull rapidly to start
engine and avoid kickback.
[7] Let engine warm up.
If choke equipped:
Slowly adjust toward RUN
position. Wait until engine
runs smoothly before
each choke adjustment.
WARNING
TO STOP ENGINE
[1] Move throttle (if equipped)
to SLOW, then to STOP.
Fuel shut-off
[2] Push rocker switch
(if equipped) to
OFF.
[3] Close fuel shut-off
valve (if equipped).
CAUTION: Do not stop
engine by moving choke
control to CHOKE.
Backfire, fire or engine
damage could occur.

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STARTING AND STOPPING
ELECTRIC (KEY) STARTER (if equipped)
TO START ENGINE
[1] Check oil level (see p. 7).
[2] Turn fuel shut-off valve (if equipped) 1/4 turn
to OPEN.
[3] Push choke lever to CHOKE position.
[4] Move throttle
(if equipped) to FAST.
Operate engine with
throttle in FAST.
Fuel shut-off Choke
OPEN
POSITION
OIL
LEVEL
FULL
[5] Push rocker switch (if
equipped) to ON.
[6] Insert key and
turn to START.
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] Let engine warm up.
If choke equipped: Slowly adjust toward RUN
position. Wait until engine runs smoothly before
each choke adjustment.
TO STOP ENGINE
[1] Move throttle
(if equipped) to SLOW.
[2] Turn key to OFF. Remove key
and store out of reach of children.
Fuel shut-off[3] Push rocker switch
(if equipped) to OFF.
[4] Close fuel shut-off valve
(if equipped).