Briggs & Stratton 120000 Installation and operation manual

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Quantumr
Operating & Maintenance
Instructions
Model Type Code
Month Day Year
Model Series
Covered in
This Manual
120000
Note: General Model Series number noted above is 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 11-13. . . . . . . . . . . . . . . . . . . . . . . . .
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 TerrainVehicles (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
(includingparalysis), 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 2001 by Briggs & Stratton Corporation FORM NO. 275177-10/01

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The Power That Works For You.
Look For Relevant Emissions Durability Period and Air Index Information On
Your Engine Emissions Label
Engines that are certified to meet the California Air Resources Board (CARB) Tier 2 Emission Standards must display
information regarding the Emissions Durability Period and the Air Index. Briggs & Stratton makes this information available
to the consumer on our emission labels. The engine emission label will indicate certification information.
TheEmissions Durability Period describes the number of hours of actual running time for which the engine is certified to
be emissions compliant, assuming proper maintenance in accordance with the Operating & Maintenance Instructions.
The following categories are used:
Moderate: Engine is certified to be emission compliant for 125 hours of actual engine running time.
Intermediate: Engine is certified to be emission compliant for 250 hours of actual engine running time.
Extended: Engine is certified to be emission compliant for 500 hours of actual engine running time.
For example, a typical walk-behind lawn mower is used 20 to 25 hours per year. Therefore, the Emissions Durability
Period of an engine with an intermediate rating would equate to 10 to 12 years.
The Air Index is a calculated number describing the relative level of emissions for a specific engine family. The lower the
Air Index,the cleaner the engine. This information is displayed in graphical form on the emissions label.
After July 1, 2000, Look For Emissions Compliance Period On
Engine Emissions Compliance Label
After July 1, 2000 certain Briggs & Stratton engines will be certified to meet the United States Environmental Protection
Agency (USEPA) Phase 2 emission standards. For Phase 2 certified engines, the Emissions Compliance Period referred
to on the Emissions Compliance label indicates the number of operating hours for which the engine has been shown to
meet Federal emission requirements. For engines less than 225 cc displacement, Category C = 125 hours, B = 250 hours
and A = 500 hours. For engines of 225 cc or more, Category C = 250 hours, B = 500 hours and A = 1000 hours.
The displacement of QUANTUMModel Series 120000 engine is 190 cc.
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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.
275177
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 INFORMATION
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)
13
8
9
12 11
10
1
2
3
45
6
14
7
GENERAL INFORMATION
ENGINE MODEL
This is a single cylinder, L-head, air-cooled engine. It is a
low emissions engine.
In the state of California, the 120000 series engines
covered in this manual are certified by the California Air
Resources Board to meet emissions standards for 125
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.
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 0.005 – 0.007 in. (0.13 – 0.18 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
275177
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
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.
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 on essential carburetor
parts. Purchase fuel in quantity that can be used within
30 days.
♦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).
♦Do not use gasoline which contains Methanol.
♦Do not mix oil with gasoline.
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 Fuel Fill Note: Remove and
discard blue plug in
fuel fill.
[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, reducing
spills and emissions.
[2] Replace cap before starting.
•Fill fuel tank outdoors or in well-ventilated area,
away from sparks, open flames, pilot lights, heat,
and other ignition sources.
•If fuel spills, wait until it evaporates before starting
engine.
•Turn engine OFF and let engine cool at least 2
minutes before removing gas cap.
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:
KEEPSPARK 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] Allow engine to
warm up.
If choke
equipped:
Slowly adjust to-
ward RUN posi-
tion. Wait until
engine runs
smoothly before
each choke ad-
justment.
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.
OR
[3] Push stop switch (if equipped) to OFF.
[4] Close fuel shut-off valve (if
equipped).

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10
STARTING AND STOPPING
ELECTRIC 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 maxi-
mum, then wait one minute). Follow
equipment manufacturer’s recommen-
dations for charging battery.
[7] Insert key and turn to START.
[8] Allow engine to 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, then release safety
brake control handle. [2] Move throttle (if equipped)
to SLOW.
OR
[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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11
MAINTENANCE
MAINTENANCE
Regular maintenance will improve the performance and
extend the life of the engine. See any Authorized Briggs &
Stratton Dealer for service. Use only genuine Briggs &
Stratton parts. Other parts may not perform as well,
may damage the engine, and may result in injury.In
addition, use of other parts may void your warranty.
EMISSION CONTROL
Maintenance, replacement or repair of the emission
control devices and systems may be performed by any
nonroad engine repair establishment or individual.
However, to obtain no charge repairs under the terms and
provisions of the Briggs & Stratton warranty statement, any
service or emission control part repair or replacement must
be performed by a factory authorized dealer.
Task
Performtask at hourly
or calendar interval,
whichever comes first.
Every 8 Hours
or Daily
25 Hours or
Every Season
50 Hours or
Every Season
100 Hours or
Every Season
100-300 Hours
Check oil level 4
Change oil 4*
Service air cleaner 4**
Inspect spark arrester
(if equipped) 4
Replace spark plug 4
Replace in-line fuel filter
(if equipped) 4
Clean debris 4***
Clean air cooling system 4**
***
Clean combustion
chamber 4
* Change oil after first 5 to 8 hours of use, then every 50
hours or every season. Change oil every 25 hours when
operating the engine under heavy load or in high
temperatures.
** Clean more often under conditions of dust or airborne debris.
Replace air cleaner parts, if very dirty.
*** On string trimmer applications:
– clean debris at each refueling, sooner if needed (see
CLEANING DEBRIS section);
– have qualified technician clean air cooling system every 30
hours, every season, or sooner if needed, especially in high
debris conditions (see AIR COOLING SYSTEM section).
CAUTION: Used oil is a hazardous waste prod-
uct. Dispose of used oil properly. Do not discard
with household waste. Check with your local
authorities, service center, or dealer for safe
disposal/recycling facilities.
CHANGING OIL
[1] Before tipping engine or
equipment to drain oil, drain
fuel from tank by running
engine until fuel tank is
empty.
[2] Disconnect spark plug wire and keep it away from
spark plug.
[3] With engine OFF but still warm remove dipstick.
[4] Top oil drain, keep air cleaner above oil outlet.
Bottom or side oil drain (if equipped), keep engine
level. Drain oil into appropriate receptacle.
Note: Top oil drain is recommended method, however
oil can drain from side (if equipped) or bottom as shown.
[5] Place engine level. Add about 5/8 quart
(20 ounces: 0.6 liter) new oil. Fill to FULL line on
dipstick. Do not overfill.
[6] Replace dipstick.
WARNING
AIR
CLEANER
BOTTOM OIL DRAIN
RATCHET
AND
EXTENSION
CUTTING
BLADE
OIL
DRAIN
PLUG
DRAIN
PLUGS
PIPE
3/8”
SQUARE
TOP OIL DRAIN
SIDE OIL DRAIN (IF EQUIPPED)
WARNING Unintentional sparking can result
in fire or electric shock.
Unintentional start-up can result in
entanglement, traumatic amputa-
tion, or laceration.

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12
MAINTENANCE
AIR CLEANER
All engines have an air cleaner cartridge. The cartridge is
either flat or oval (see illustrations). In addition, some
engines have a pre-cleaner.
Pre-cleaner
To clean pre-cleaner (if equipped), separate it from
cartridge and wash in liquid detergent and water. Air dry
thoroughly. Do not oil. Re-assemble dry pre-cleaner on
clean cartridge.
CAUTION: Do not use pressurized air or
solvents to clean cartridge. Pressurized air can
damage cartridge; solvents will dissolve car-
tridge.
REMOVING AND RE-INSTALLING FLAT AIR
CLEANER
Flat Air Cleaner
SCREW COVER BASE
CARTRIDGE
P/N 491588
OR P/N 5043
CARTRIDGE
LIP
ASSEMBLE SO
CARTRIDGE LIP
TOUCHES BASE
IN DIRECTION
SHOWN
PRE-CLEANER LIP
TABS AND SLOTS
PRE-CLEANER
P/N 493537
[1] Loosen screw and tilt cover down.
[2] Remove air cleaner.
[3] Re-install clean (or new) air cleaner assembly inside
cover. Lip of pre-cleaner (if equipped) must be at
bottom of cartridge pleats.
[4] Insert cover’s tabs into slots in bottom of base.
[5] Tilt cover up into place and tighten screw.
REMOVING AND RE-INSTALLING OVAL AIR
CLEANER
Oval Air Cleaner
ÌÌÌ
ÌÌÌ
ÌÌÌ
ASSEMBLESO THAT
CARTRIDGE LIP
SITS INSIDE BASE
2 SCREWS
COVER
BASE
CARTRIDGE
P/N 497725
PRE-CLEANER
273185
[1] Loosen two screws and lift off cover.
[2] Remove air cleaner assembly (pre-cleaner, if
equipped, and cartridge) from base.
[3] Re-install clean (or new) air cleaner assembly in base.
Air cleaner must fit securely in base.
[4] Place cover over air cleaner and tighten screws.
REPLACE FUEL FILTER (IF EQUIPPED)
PART NO. 298090
OR 5018
FUEL FILTER
FUEL HOSE CLAMPS
[1] Disconnect spark plug wire and keep away
from spark plug.
[2] Drain fuel tank or close fuel shut-off valve be-
fore replacing fuel filter. Otherwise, fuel can
leak out, creating a fire/explosion hazard.
WARNING
Starting engine creates sparking.
Sparking can ignite nearby flammable gases.
Explosion and fire could result.

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13
MAINTENANCE
ENGINE AND ENGINE PARTS
We recommend that you see an authorized Briggs & Stratton Service Dealer for all maintenance and service of the engine
and engine parts. Use only genuine Briggs & Stratton parts.
WARNING If you perform any maintenance on the engine, first disconnect the spark plug wire
from the spark plug, and disconnect the battery at the negative terminal (electric
starter engines only) to prevent unintentional sparking. Unintentional sparking can
result in fire or electric shock. Unintentional start-up can result in entanglement,
traumatic amputation or laceration. Use only correct tools.
WARNING •Do not strike the flywheel with a hammer or hard object because the flywheel may
later shatter during operation.
•Do not tamper with governor spring, links or other parts to increase engine speed.
MUFFLER Replacement parts for the
muffler must be the same and
installed in the same position
as the original parts, other-
wise fire can occur.
If muffler is equipped with spark
arrester screen, remove
screen for inspection. Replace screen if damaged or plugged.
WARNING
SPARK PLUG
Use only Briggs & Stratton Spark Tester (part number
19368) to check for spark.
Note: In some areas, local
law requires using resistor
spark plug to suppress
ignition signals. If this en-
gine was originally
equipped with resistor
spark plug, use same type
for replacement.
.030”(0.76 mm)
WIRE GAGE
RESISTOR P/N 802592
STANDARD P/N 492167
COMBUSTION DEPOSITS
We recommend that after every 100-300 hours you have
an authorized Briggs & Stratton Service Dealer remove
combustion deposits from the cylinder, cylinder head, top
of piston, and around valves.
FUEL SYSTEM
WARNING Replacement parts for fuel
system (cap, hoses, tanks,
filters, etc.) must be the same
as original parts, otherwise
fire can occur.
AIR COOLING SYSTEM
Over time debris may accumulate in cylinder cooling fins
and cannot be observed without partial engine disassem-
bly. For this reason, we recommend that you have an
authorized Briggs & Stratton Service Dealer clean the air
cooling system per recommended intervals. (See Mainte-
nance Schedule on page 12.) Equally important is to keep
top of engine free from debris. See cleaning debris below.
CLEANING DEBRIS Engine parts should be kept
clean to reduce the risk of
overheating and ignition of accu-
mulated debris. This is especial-
ly important if cutting tall grass.
WARNING CAUTION: Do not use water to clean engine
parts. Water could contaminate fuel system. Use a
brush or dry cloth.
Finger Guard Linkage, Springs, Controls Muffler
CLEAN
Daily or before every use, clean
grass, chaff or accumulated de-
bris from engine in areas shown.
Keep area around and behind
muffler free of any combustible
debris.
Note: On string trimmer applica-
tions, clean accumulated debris
at each refueling, sooner if
needed.
CLEAN
CLEAN
CLEAN CLEAN
CLEAN
CLEAN

Document: - page 14 (Black)
Screen angle and frequency: 45.0000, 150.0000
14
ADJUSTMENTS
THROTTLE ADJUSTMENT
If the engine does not start or if it runs roughly, the remote
throttle control may need adjustment. See your authorized
Briggs & Stratton dealer or follow the instructions below.
WARNING
Prevent unintentional starting.
Before performing adjustments:
•Remove spark plug wire from spark plug.
•Disconnect battery at negative terminal (only
engines with electric start).
TO ADJUST REMOTE THROTTLE*
[1] Loosen casing clamp screw.
[2] Move governor control lever, wire, and casing as
far as possible in direction shown.
[3] Move remote throttle control to FAST.
[4] Tighten casing clamp screw.
[5] Move throttle to STOP (if equipped).
GOVERNOR
CONTROL
LEVER
CASING
CLAMP
SCREW
WIRE &
CASING
* On some models the governor lever is bent into position
and is not adjustable.
TO ADJUST STOP SWITCH
[1] Governor control lever should make good contact
with stop switch (see illustration). Readjust if
necessary.
[2] Check operation of throttle.
GOVERNOR
CONTROL
LEVER
STOP
SWITCH
CARBURETOR ADJUSTMENT
WARNING
The manufacturer of the equipment on which this
engine is installed specifies top speed at which the
engine will be operated. DO NOT EXCEED this speed.
The carburetor on this engine is not adjustable.
Note: Engines operated at about 3000 to 5000 feet (900 to
1500 meters) above sea level may require a high altitude
carburetor main jet. If erratic performance is observed,
contact a Briggs & Stratton Authorized Service Dealer for
cost to install/purchase a high altitude carburetor main jet, if
available.

Document: - page 15 (Black)
Screen angle and frequency: 45.0000, 150.0000
Add sales tax if you live in any of the following states:
**AL 5%, CT 6%, FL 6.5%, GA %, KY 6%, MI 6%, MN 6%,
MO .225%, NY 8.5%, OH 5%, TN 6%, TX 6.25%, WA 6.5%, WI 5%
Payment Method: Fill in both sides of this order form carefully jCheck or money order enclosed payable to
Briggs & Stratton Corporationin the amount of $_______ (U.S. Dollars, please)
jPlease charge my jMasterCard jVISA
CREDIT CARD NUMBER
SIGNATURE (REQUIRED FOR CREDIT CARD ORDERS) EXPIRATION DATE
Parts List Shipping & Handling **Add State Sales Tax Total
$2.00 $1.50
To purchase a complete list of Genuine Briggs & Stratton Parts for your engine, fill in both sides of this order form carefully. We cannot fill your order without the correct Engine Model/Type/Code. Allow 3 to 4 weeks for delivery.
15
SERVICE & STORAGE
PARTIAL LIST OF GENUINE BRIGGS &
STRATTON PARTS BRIGGS & STRATTON
PART PART NO.
Flat air cleaner cartridge 491588 -or- 5043
Flat air cleaner pre-cleaner 493537
Oval air cleaner cartridge 497725
Oval air pre-cleaner 273185
Oil 100005 -or- 100028
Fuel Filter 298090 -or- 5018
Gas additive 5041
Resistor spark plug 802592
Standard spark plug 492167
Long life platinum spark plug 5062
(used on most L-head engines)
Spark plug wrench 89838
Spark tester 19368
Oil pump kit 5056
(uses standard electric drill to remove oil from engine quickly)
SERVICE
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.
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 5,000 Master
Service Technicians. Look for these signs
wherever Briggs & Stratton service is offered.
You may locate your nearest Authorized Briggs & Stratton
Service Dealer in our dealer locator map on our web site
 or in the “Yellow Pages”
directory under “Engines, Gasoline”or “Gasoline
Engines,”or “Lawn Mowers”or similar category.
Note: Walking fingers logo and “Yellow Pages”are regis-
tered trademarks in various jurisdictions.

An illustrated shop manual includes
common specifications and detailed in-
formation covering adjustment, tune-up
and repair of Briggs & Stratton single
cylinder, L-head, 4 cycle engines. It is
available for purchase from an Autho-
rized Briggs & Stratton Service Dealer or
you can order it from the factory. Write:
Briggs & Stratton Corporation
Attn: Service Division
P. O. Box 1144
Milwaukee, WI 53201
Part No. 270962

Document: - page 16 (Black)
Screen angle and frequency: 45.0000, 150.0000
Your Engine Type Code
Model
Fill in both sides, clip and return to:
Briggs & Stratton Corporation
P.O. Box 1144
Name Address
City State Zip Country
To purchase a complete list of Genuine Briggs & Stratton Parts for your engine, fill in both sides of this order form carefully. We cannot fill your order without the correct Engine Model/Type/Code. Allow 3 to 4 weeks for delivery.
Milwaukee, WI 53201–1144 U.S.A.
16
SERVICE & STORAGE
STORAGE
Engines stored over 30 days need special attention.
[1] To prevent gum from forming in fuel system or on
essential carburetor parts:
a) if fuel tank contains oxygenated or reformulated
gasoline (gasoline blended with an alcohol or an
ether), run engine until it stops from lack of fuel,or b) if
fuel tank contains gasoline, either run engine until it
stops from lack of fuel, or add a gasoline additive to the
gas in the tank. (See parts list. Single –use pouches of
gas additive are available from your service dealer.) If
you use a gas additive, run the engine for several
minutes to circulate the additive through the carburetor.
Then, engine and fuel can be stored up to 24 months.
[2] While engine is still warm, change oil.
[3] Remove spark plug and pour about 1/2 oz. (15 ml) of
engine oil into cylinder. Replace spark plug and crank
slowly to distribute oil.
[4] Clean engine of surface debris, chaff or grass.
WARNING
[5] Store in a clean, dry area.
Do not store in same area
as a stove, furnace, water
heater, or other appliance
that uses a pilot light or
has a device that can
create a spark.

17
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.
        
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)
EMISSION CONTROL WARRANTY COVERAGE IS APPLICABLE
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 (AND AFTER JANUARY 1, 2001 IN CANADA).
California and United States Emission Control Defects Warranty Statement
The California Air Resources Board (CARB), U.S. EPA and B&S are
pleased to explain the Emission Control System Warranty on your
model year 2000 and later small off-road engine (SORE). In California,
new small off-road engines must be designed, built and equipped to
meet the State’s stringent anti-smog standards. Elsewhere 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, ne-
glect or improper maintenance of your small off-road 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.
Where a warrantable condition exists, B&S will repair your small off-
road engine at no cost to you including diagnosis, parts and labor.
Briggs & Stratton Emission Control Defects Warranty Coverage
Small off-road engines are warranted relative to emission control
parts defects for a period of two years, subject to provisions set forth below. If any covered part on your engine is defective, the part will be repaired or replaced by B&S.
Owner’s Warranty Responsibilities
As the small off-road engine owner, you are responsible for the per-
formance of the required maintenance listed in your Operating and
Maintenance Instructions. B&S recommends that you retain all your
receipts covering maintenance on your small off-road engine, but
B&S cannot deny warranty solely for the lack of receipts or for your
failure to ensure the performance of all scheduled maintenance.
As the small off-road engine owner, you should however be aware
that B&S may deny you warranty coverage if your small off-road en-
gine or a part has failed due to abuse, neglect, improper mainte-
nance or unapproved modifications.
You are responsible for presenting your small off-road engine to an
Authorized B&S Service Dealer as soon as a problem exists. The
undisputed 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.
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 Operating and Maintenance Instructions.
1. Warranted Parts
Coverage under this warranty extends only to the parts listed be-
low (the emission control systems parts) to the extent these
parts were present on the engine purchased.
a. Fuel Metering System
•Cold start enrichment system
•Carburetor and internal parts
•Fuel Pump
b. Air Induction System
•Air cleaner
•Intake manifold
c. Ignition System
•Spark plug(s)
•Magneto ignition system
d. Catalyst System
•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.
3. No Charge
Repair or replacement of any Warranted Part will be performed
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. For emissions warranty service contact your nearest Au-
thorized B&S Service Dealer as listed in the “Yellow Pages” un-
der “Engines, Gasoline,” “Gasoline Engines,” “Lawn Mowers,”
or similar category.
4. Claims and Coverage Exclusions
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.
5. Maintenance
Any Warranted Part which is not scheduledfor replacement as re-
quired maintenance or which is scheduled only for regularinspec-
tion to the effect of “repair or replace as necessary” shall be war-
ranted as to defects for the warranty period. Any Warranted Part
which is scheduled for replacement as required maintenance
shall be warranted as to defects only for the period of time up to
the first scheduled replacement for that part. Any replacement
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 maintenance, as
defined in the B&S Operating and Maintenance Instructions.
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.

18
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.
About your engine warranty: (see next page 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.
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 its 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 someof
the causes of engine failure that the warranty does not cover.
Normal wear:
Engines, like all mechanical devices, need periodic parts
serviceandreplacementtoperformwell.Warrantywillnotcover
repair when normal use has exhausted the life of a part or an
engine.
Improper maintenance:
Thelifeofanenginedependsupontheconditionsunderwhichit
operates, and the care it receives. Some applications, such as
tillers,pumpsandrotarymowers,areveryoftenusedindustyor
dirtyconditions,whichcancausewhatappearstobepremature
wear.Suchwear,whencausedbydirt,dust,sparkplugcleaning
grit, or other abrasive material that has entered the engine
because of impropermaintenance, is not covered bywarranty.
This warranty covers engine related defective material
and/orworkmanshiponly,andnotreplacementorrefundof
the equipment to which the engine may be mounted. Nor
does the warranty extend to repairs required because 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
engine life. (Contact equipment manufacturer.)
3. Leakingcarburetors,cloggedfuelpipes,stickingvalves,or
other damage, caused by using contaminated or stale fuel.
(Use clean, fresh, lead-free gasoline and Briggs & Stratton
gasoline stabilizer, Part No. 5041.)
4. Parts which are scored or broken because an engine was
operatedwithinsufficientorcontaminatedlubricatingoil,or
an incorrect grade of lubricating oil. Refill when necessary;
OIL GARDmay not shut down running engine. Engine
damage may occur if oil level is not properly maintained.
Read the recommended maintenance intervals for your
engine outlined in the Operating & Maintenance
Instructions.
5. Repairoradjustmentofassociatedpartsorassembliessuch
asclutches,transmissions,remotecontrols,etc.,whichare
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, oruse of a non-original air cleaner element or
cartridge. Read the recommended maintenance intervals
for your engine outlined in the Operating & Maintenance
Instructions.
7. Partsdamagedbyoverspeeding,oroverheatingcausedby
grass,debris,ordirt,whichplugsorclogsthecoolingfins,or
flywheelarea,ordamagecausedbyoperatingtheenginein
a confined area without sufficient ventilation. Read the
recommended maintenance intervals for your engine
outlined in the Operating & Maintenance Instructions.
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,
improper attachment of equipment to engine crankshaft,
overspeeding or other abuse in operation.
9. Abentorbrokencrankshaft,causedbystrikingasolidobject
with the cutter blade of a rotary lawn mower, or excessive
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.
Warranty is available only through service dealers which
have been authorized by Briggs & Stratton Corporation.
You may locate your nearest Authorized Briggs & Stratton
Service Dealer in our dealer locator map at
www.briggsandstratton.com. Your nearest Authorized
Service Dealer is also listed in the “Yellow PagesE”ofyour
telephone directory under “Engines, Gasoline”or
“Gasoline Engines,” “Lawn Mowers,”or similar category.
Briggs & Stratton Engines Are Made Under One Or More Of The Following Patents: Design D-247,177 (Other Patents Pending)
6,135,426
6,116,212
6,077,063
6,064,027
6,040,767
6,014,808
5,894,715
5,823,153
5,819,513
5,813,384
5,809,958
5,765,713
5,645,025
5,642,701
5,619,845
5,606,948
5,606,851
5,548,955
5,546,901
5,503,125
5,501,203
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
5,040,503
5,040,644
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
4,684,917
4,633,556
4,630,498
4,522,080
4,520,288
4,453,507
4,430,984
DES. 309,458
DES. 309,457
DES. 308,871
DES. 308,872
DES. 356,951
DES. 361,771
DES. 375,963

19
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.
BRIGGS & STRATTON ENGINE OWNER WARRANTY POLICY
effective July 1, 2001
Replaces all undated Warranties and all Warranties
dated before July 1, 2001
LIMITED WARRANTY
Briggs&StrattonCorporationwillrepairorreplace,freeofcharge,anypart,orpartsoftheenginethataredefectivein
material or workmanship or both. Transportation charges on parts submitted for repair or replacement under this
Warranty must be borne by purchaser. This warrantyis effective for the time periods and subject to theconditions
stated herein. For warranty service, find the nearest Authorized Service Dealer in our dealer locator map at
www.briggsandstratton.comor as listed in the ‘YellowPages’under‘Engines,Gasoline,’‘GasolineEngines,’‘Lawn
Mowers’or similar category.
THERE IS NO OTHER EXPRESS WARRANTY. IMPLIED WARRANTIES, INCLUDING THOSE OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED TO ONE YEAR FROM
PURCHASE,ORTOTHEEXTENTPERMITTEDBYLAWANYANDALLIMPLIEDWARRANTIESAREEXCLUDED.
LIABILITY FOR CONSEQUENTIAL DAMAGES UNDER ANY AND ALL WARRANTIES ARE EXCLUDED TO THE
EXTENT EXCLUSION IS PERMITTED BY LAW. Some countries or states do not allow limitations on how long an
implied warranty lasts, and some countries or states do not allow the exclusion or limitation of incidental or
consequentialdamages,sotheabovelimitationandexclusionmaynotapplytoyou.Thiswarrantygivesyouspecific
legal rights and you may also have other rights which vary from country to country and state to state.
WARRANTY PERIOD*
WITHIN U.S.A. AND CANADA OUTSIDE U.S.A. AND CANADA
PRODUCTS CONSUMER USE COMMERCIAL USE CONSUMER USE COMMERCIAL USE
Vanguardengines. 2 years
Diamond Plus, Industrial Plus, I/C, and
sleeve bore Intekengines. 2 years 1 year 2 years 1 year
Quantumand Diamond Powerand Kool
Bore Intekengines. 2 years 90 days 2 years 90 days
Standard engines installed on lawn
mowers, riders, edgers, chippers,
shredders, string trimmers, tillers and
Sno/Gard engines. 2 years 90 days 1 year 90 days
Classicengines and all other standard
engines and products. 1 year 90 days 1 year 90 days
* NOTE THE FOLLOWING SPECIAL WARRANTY PERIODS: 5yearsforconsumeruse,90daysforcommercialuse ofTouch-N-
MowstarteronQuantumand Intekengines; 2yearsforemission control systems on enginescertifiedby EPA andCARB; 1
yearforconsumeruseofallenginesandproductsinIndia,commercialuseofVanguardengines inIndia,andconsumeruseof
Quantum Diamond Powerand Kool Bore Intekengines in Australia, New Zealand, the Middle East, and Africa.
Thewarrantyperiodbeginsonthedateofpurchasebythefirstretailconsumerorcommercialenduser,andcontinuesfortheperiodof
time stated in the table above. “Consumer use”means personal residential household use by a retail consumer. “Commercial use”
meansallotheruses,includinguseforcommercial,incomeproducingorrentalpurposes.Onceanenginehasexperiencedcommer-
cial 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.
            
               
             
       

Document: - page 1 (Black)
Screen angle and frequency: 45.0000, 150.0000
          
           
          
             
           
             
             
             
   
           
           
               
             
             
           
              
                
               
      
              
              
      
             
       
             
               
                                 
  
               
              
               
                 
    
                
                 
            
              
             
       
             
         
            
                
    
         
                             
     
   
              
              
    
     
•     
•   
•  
   
•  
• 
  
• 
•  
  
• 
• 
•     
        
•        
•  
    
              
              
                   
     
  
             
               
               
            
                
            
      
             
               
              
               
              
 
              
              
            
              
              
           
             
             
     
  
            
               
 
                 
                           
                           
                            
         
          
          
          
                                
      
                                
    
              
                           
                             
                                            
            
      
      CE MOTEUR EST CONFORME AUX NORMES
ANTIPOLLUTION 2000 – 2001 DE CALIFORNIE
POUR LES PETITS MOTEURS HORS ROUTE ET
AUX NORMES ENVIRONNEMENTALES
AMÉRICAINES (EPAPHASE 2) POUR LES
PETITS MOTEURS HORS ROUTE. CONSULTEZ
LE MANUEL DU PROPRIÉTAIRE POUR LES
SPÉCIFICATIONS, L’ENTRETIEN ETLES
AJUSTEMENTS. CONFORME ÀLA PÉRIODE
D’ÉMISSION EPA: CATÉGORIE : C
FAMILLE YBSXS.3192VA 274812
INFORMATIONS IMPORTANTES
CORPORATION BRIGGS & STRATTON