Briggs & Stratton PROFESSIONAL SERIES 110000 Installation and operation manual

Operating & Maintenance
Instructions
Model 110000 120000 Series covered in this manual
FORM NO. 276348-01/06
PRINTEDINU.S.A.
©Copyright 2006 by Briggs & Stratton Corporation
www.briggsandstratton.com
The Power That Works For You.®

2
Safety References
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.
This manual contains safety
information to make you aware of
the hazards and risks associated with engines, and
how to avoid them. Because Briggs & Stratton does
not necessarily know what equipment this engine will
power, it is important that you read and understand
these instructions and the instructions for the
equipment this engine powers.
Table of Contents
Safety References 2..........................
Engine Features 3............................
Operator Safety 4 - 5.........................
Quick Start Instructions 6 - 7...................
Troubleshooting 8............................
ReadystarttEngines 9.......................
Starting and Stopping Instructions 10...........
Oil 11 - 12...................................
Fuel 13....................................
FRESH STARTtFuel Preserver Fuel Cap 14...
Maintenance 15 -- 17.........................
Storage and Service 18......................
Engine Specifications 19.....................
Emission Statement and Warranty 20 - 21.......
Engine Warranty Policy 22 -- 23................
SYMBOLS ASSOCIATED
WITH THIS ENGINE:
Explosion
Toxic Fumes
Moving Parts
Shock
Hot Surface
Kickback
Fire
Fuel Shutoff
Read
Manual
Choke
Oil
Fuel
On Off
Stop
Hazardous
Chemicals Slow
Fast
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.
WARNING
The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.
WARNING
This engine is shipped from Briggs & Stratton
without oil. If you start the engine without oil, the
engine will be damaged beyond repair and will not
be covered under warranty.
CAUTION

3
Engine Features
1. Rewind rope handle
2. Fuel cap
3. Air cleaner
4. Primer bulb
5. Spark plug wire
6. Engine identification
Model Type and Date Code
7. Oil fill and dipstick
8. Side oil drain, if equipped
9. Muffler and spark arrester, if
equipped
4
3
2
1
6
5
89
7
6

4
Operator Safety
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.
• 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 choke carburetor to stop engine.
WHEN TRANSPORTING EQUIPMENT
• Transport with fuel tank EMPTY.
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
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.
WARNING
Fresh StarttFuel Cap
• IF SWALLOWED, call physician immediately.
Do not induce vomiting. If inhaled, remove to
fresh air. In case of eye or skin contact, flush
with water for 15 minutes.
• Store unopened cartridges in a cool, dry,
well-ventilated area. Keep open cartridge in
fuel cap, and fuel cap closed on fuel tank when
not in use.
Contents are HARMFUL OR FATAL IF
SWALLOWED. Avoid contact to eyes,
skin, or clothing. Do not take internally.
Avoid breathing the mist or vapor.
Overexposure to eyes or skin can
cause irritation. KEEP STABILIZER
OUTOFTHEREACHOFCHILDREN.
Fuel stabilizer is a hazardous
chemical.**
• In case of emergency, contact a physician
immediately.
• For material safety information
call 1-800-424-9300
DANGER
** Fuel stabilizer contains: 2,6-di-tert-butylphenol
(128-39-2) and aliphatic petroleum distillate
(64742-47-8).
Your engine may be equipped with a Fresh
StarttFuel Cap
Cartridge is shown with tab
partially removed.

5
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, impellers, pulleys,
sprockets, etc., must be securely attached.
WARNING
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
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
• Allow muffler, engine cylinder and fins to cool
before touching.
• Remove accumulated debris 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.
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.
Before performing maintenance or repairs:
• Disconnect spark plug wire and keep it away
from spark plug.
• Disconnect battery at negative terminal (only
engines with electric start).
• Use only correct tools.
• 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.
When testing for spark:
• Use approved spark plug tester.
• Do not check for spark with spark plug
removed.
Unintentional sparking can result in
fire or electric shock.
Fire or explosion can cause severe
burns or death.
Unintentional start-up can result in
entanglement, traumatic
amputation, or laceration.
WARNING

6
See page 11 for details.
HOW?
Unscrew and remove oil cap.
Pour in oil. Replace cap.
WHAT KIND?
High quality SAE 30 motor oil.
HOW MUCH?
To FULL line on dipstick.
Engine holds about 20 oz. (0.61l).
SPECIAL CONCERNS?
Do not overfill.
Do not tip engine.
See page 13 for details.
HOW?
Remove gas cap. Pour in gas. Replace cap.
WHAT KIND?
HOW MUCH?
Fill to one inch below top of fuel fill neck.
SPECIAL CONCERNS?
Fuel equipment outdoors. If fuel spills, wait
until it evaporates before starting engine.
Unleaded, 85 octane or higher.
FULL
ADD OIL
WIPE DIPSTICK.
REPLACE DIPSTICK
AND TIGHTEN CAP.
REMOVE DIPSTICK
TO READ LEVEL.
1
ADD GAS
This manual contains safety information to make you aware of the hazards and risks
associated with engines. Read the Operating Manual before starting your engine.
WARNING
Starting engine creates sparking.
Gasoline and its vapors are extremely
flammable and explosive. Fire or
explosion can cause severe burns or
death.
2 3 4
23 4
1
If fuel spills, wait until it evaporates before starting
engine.
DO NOT use pressurized starting fluids.

7
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.
Rotating parts can cause traumatic
amputation or severe laceration can
result.
For complete starting instructions
see page 10.
HOW?
Locate primer bulb. Press with finger. Wait two
seconds between each press.
HOW MANY TIMES?
Press 5 times the FIRST TIME you start engine.
For all future starts, press
3 times.
SPECIAL CONCERNS?
Pressing primer too many times can flood
engine with gas. A flooded engine will not start.
See Troubleshooting section.
HOW?
Stand behind equipment.
Close bail, or operator control bar, on
equipment with this feature. If you do not keep
bail held against equipment handle, engine will
not start.
Slowly pull cord until you feel resistance, then
pull quickly.
SPECIAL CONCERNS?
To Stop Engine --
Let go of bail, or operator control bar, which
activates brake and stops engine from running.
PUSH PRIMER
PULL STARTER HANDLE
14
If ReadyStart ™go to step 4.
If electric start equipped see page 10.
Need assistance? 1-800-233-3723
(USA and Canada ONLY,Pre-recorded message.)
www.briggsandstratton.com
If speed control equipped, start in FAST position.
Also, see warning at right.
2 3
234
1
WARNING
To avoid kickback, slowly pull the cord until you feel
resistance, then pull rapidly.
Keep hands, feet,hair, clothing, or accessories away
from rotating parts.

8
Troubleshooting
WARNING
When starting engine, pull cord slowly until
resistance is felt, then pull rapidly.
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.
Engine will Not Start
OutofFuel
• Add fuel to tank.
Engine Flooded
• Set choke (if equipped) to OPEN/RUN position,
and continue to pull starter handle.
Spark Plug Fouling
• Check and ensure the spark plug is clean. Check
the gap with a feeler gage and reset to .51 mm or
.020 in. if necessary.
• If the electrode is burned or worn, replace spark
plug with new spark plug.
This engine is shipped from Briggs & Stratton
without oil. If you start the engine without oil, the
engine will be damaged beyond repair and will
not be covered under warranty.
CAUTION
Ensure fuel cap is in place before starting engine
Turn engine OFF and let engine cool at least 2 min-
utes before removing fuel cap.
Check fuel lines, tank, cap, and fittings frequently
for cracks or leaks. Replace if necessary.
Do not crank engine with spark plug removed.
WARNING
To prevent oil or fuel from entering combustion
chamber or air cleaner, keep the spark plug
side of engine up during transport, when
draining oil, cleaning debris, etc. otherwise
engine damage could occur.
CAUTION
Engine may have been tipped
during transport.
• Check for fouled spark plug.
• Check air cleaner filter for oil saturation.
Squeeze pre--cleaner in clean, absorbant cloth
to remove ALL EXCESS oil. If air cleaner is
saturated, replace with new cartridge.
Gasoline and its vapors are extremely
flammable and explosive.
Fire or explosion can cause severe burns
or death.
Starter Handle will Not Pull
• Close bail or operator control bar.
• Place equipment on flat level surface.
• Remove all external equipment/engine loads before
starting engine.
• Direct coupled equipment components such as, but
not limited to, blades, impellers, pulleys, sprockets,
etc., must be securely attached.
Engine is Smoking or Running Rough

9
ReadystarttInstructions
1. Check the oil level. Ensure level is at FULL mark
on the dipstick. Use a high quality motor oil.
Check the oil recommendations for the correct oil
type to use depending on expected starting
temperatures.
FULL
2. Move speed control to FAST, if equipped. Operate
engine in FAST position.
3. Close bail, or operator control bar on equipment
with this feature.
4. Start your engine. See options at right.
Rewind Start
• Grasp rope handle. Pull slowly until resistance is
felt, then pull rapidly to start engine and avoid
kickback.
Electric Start
• Insert key and turn to start.
• Allow engine to warm up.
To prolong starter life use short starting cycles
(5 seconds maximum, then wait one minute).
Follow equipment manufacturer’s
recommendations for charging battery.
CAUTION
Stopping Engine
• Release bail or operator control bar -- O R -- Move
throttle (if equipped) to SLOW and then STOP
position.

10
Starting Instructions
1. Check oil level. Ensure level is at FULL mark on
dipstick. Use a high quality motor oil. Check the
oil recommendations for the correct oil type to use
depending on expected starting temperatures.
FULL
2. Open fuel shut-off valve1/4 turn, if equipped.
3. Locate primer bulb on the engine and push 3
times -- O R -- rotate choke knob or move choke
control lever to CHOKE position.
Primer Choke
4. Move speed control to FAST,
if equipped. Operate engine
in FAST position.
5. Close bail, operator control
bar on equipment with this
feature.
6. Start your engine. See
options stated here:
Rewind Start
• Grasp rope handle. Pull slowly until resistance is
felt, then pull rapidly to start engine and avoid
kickback.
Electric Start
• Insert key and turn to START.
To prolong starter life, use short starting cycles
(5 seconds maximum, then wait one minute).
Follow equipment manufacturer’s
recommendations for charging battery.
CAUTION
7. Allow engine to warm up.
Note: If choke equipped: Slowly adjust toward RUN
position. Wait until engine runs smoothly before
each choke adjustment.
Stopping Engine
Do not stop engine by moving choke control to
CHOKE. Backfire, fire or engine damage could
occur.
WARNING
1. Move throttle lever (if equipped) to SLOW, then
release safety brake control handle -- O R -- Move
throttle (if equipped) to SLOW and then STOP
position.
2. Push stop switch (if equipped) to OFF -- O R -- Turn
key to OFF. Remove key and store out of reach of
children.
3. Close fuel shut--off valve (if equipped).

11
Oil
Check oil level before starting the engine.
Keep oil level at FULL. Do not overfill.
Check level daily, or after every eight (8) hours.
Capacity
Engine oil capacity is 2/3 qt. (22 oz.; 0.65 liter). NOTE: Often residual oil remains in engine. Fill to FULL line on
dipstick.
Oil Recommendation
Use a high quality detergent oil classified “For Service SF, SG, SH, SJ” or higher.
Do not use special additives.
SAE 30 40
° F and higher (5 ° C and higher)
is good for all purpose use above 40°F, use below
40°F will cause hard starting.
10W-30 0to100
° F (--18 to 38 ° C)
is better for varying temperature conditions. This
grade of oil improves cold weather starting, but may
increase oil consumption at 80°F(27°C) or higher.
Check oil level frequently at higher temperatures.
Synthetic 5W-30 --20 to 120
° F (--30 to 40 ° C)
provides the best protection at all temperatures as
well as improved starting with less oil consumption.
5W-30 40
° F and below (5 ° C and below)
is recommended for winter use, and works best in
cold conditions.
Checking and Adding Oil
1. Place engine level and clean around oil fill area.
Oil Fill
2. Remove dipstick and wipe with clean cloth.
3. Replace and tighten dipstick. Remove and check
oil level.
4. Oil level should be at FULL line on dipstick.
FULL
5. If needed, add oil slowly.
6. Re--check oil level. Do not over fill.
7. Replace and tighten dipstick.

12
Changing Oil
Change oil after first 5 to 8 hours of use, then every 50
hours. Change oil every 25 hours when operating the
engine under heavy load or in high temperatures.
1. Run engine until it runs out of fuel. Otherwise, fuel
can leak out, creating a fire/explosion hazard,
when you tip engine in Step 4.
2. Disconnect spark plug wire and keep it away from
spark plug.
3. With engine OFF but still warm remove dipstick.
4. Drain oil into appropriate receptacle.
Top oil drain: Keep air cleaner above oil outlet.
Bottom or side oil drain (if equipped): Keep
engine level.
AIR
CLEANER
TOP OIL DRAIN
SIDE OIL DRAIN
(IF EQUIPPED)
RATCHET
AND
EXTENSION
CUTTING
BLADE
OIL
DRAIN
PLUG
BOTTOM OIL DRAIN
DRAIN
PLUGS
PIPE
3/8”
SQUARE
Top oil drain is recommended method, however oil can
drain from side (if equipped) or bottom as shown.
5. Place engine level. Add about 20 oz or 0.61 liter
of oil. Note: Often residual oil remains in engine.
Fill to FULL line on dipstick. Do not overfill.
6. Replace dipstick.
Used oil is a hazardous waste product. 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.
CAUTION
To prevent unintentional starting, disconnect
spark plug wire and keep it away from spark
plug.
Unintentional start-up can result in shock,
entanglement, traumatic amputation, or
laceration.
WARNING
Changing Oil Filter (if equipped)
Replace oil filter after every 100 hours of operation.
OIL FILTER
1. After draining engine of used oil, fill with fresh oil.
2. Before installing new filter, lightly oil gasket with
fresh, clean oil.
3. Screw filter on by hand until gasket contacts oil
filter adapter.
4. Tighten 1/2 -- 3/4 turn more.
5. Start and run engine at idle to check for leaks.
6. Stop engine. Re--check oil level. Add oil if
required.

13
Fuel
Type of gasoline to use
This engine is certified to operate on gasoline. The
emission control system for this engine is EM (Engine
Modifications).
Always use gasoline that meets these requirements:
• Clean, fresh unleaded gasoline.
• A minimum of 87 octane/87 AKI (91 RON). If
operating at high altitude, see below.
• Gasoline with up to 10% ethanol (gasohol) or up to
15% MTBE (methyl tertiary butyl ether), is
acceptable.
• Use of any gasoline other than those approved
above will void the engine warranty. In some local
areas fuel pumps may be marked if the gasoline
contains alcohols or ethers. If you are unsure about
the gasoline you purchase check with your fuel
provider.
• Do not modify the engine fuel system or carburetor
to run on alternative fuels.
• Never mix oil with gasoline.
All gasoline is not the same. If you experience starting
or performance problems after new gasoline has been
used in your engine, switch to a different fuel provider or
change fuel brands.
Some fuels, called oxygenated or reformulated fuels,
are fuels 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.
CAUTION
Fuel Storage
Fuel can become stale when stored over 30 days. Stale
fuel causes acid and gum deposits to form in fuel
system or on essential carburetor parts. Mix fuel
stabilizer with fuel in tank or storage container. Run
engine for a short time to circulate stabilizer through
carburetor and engine. Engine and fuel can be stored
up to 24 months.
If fuel stabilizer is not used, you need to drain gasoline
from equipment prior to storage.
If the FRESH START continuous fuel preserver fuel cap
(concentrated liquid cartridge) is used, there is no need
to drain fuel, as long as cartridge contains stabilizer for
seasonal storage.
Fuel Stabilizer
To protect the fuel system from gum formation, use
Briggs & Stratton FRESH STARTtfuel stabilizer plus,
or FRESH START continuous fuel preserver fuel cap
(concentrated liquid cartridge), or FRESH START
preservative & stabilizer (granular).
High-altitude Use
At higher altitudes (over 5,000 feet), 85 octane/85 AKI
(89 RON) gasoline can be used. Operation at high
altitude may require a high-altitude carburetor jet kit to
improve performance and decrease fuel consumption.
See your local authorized Briggs & Stratton dealer for
more information.
Adding Fuel
1. Turn engine OFF and let engine cool at least 2
minutes before removing gas cap.
2. Remove cap. Fill tank to approximately 1 inch
(25mm) below top of neck to allow for fuel
expansion. Be careful not to overfill.
3. Replace cap before starting.
Fuel cap
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.
• 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.
WARNING

14
Fresh StarttContinuous Fuel Preserver - Fuel Cap
Your engine may be equipped with
a Fresh Start fuel cap.
Cartridge is shown with tab
partially removed.
Fresh Start fuel cap is designed to
hold a cartridge which contains fuel stabilizer.
1. Place silver foil seal end of cartridge into fuel cap.
2. Press to “snap” cartridge into place.
3. Remove the white tab to expose membrane.
4. Reinstall fuel cap on engine fuel tank.
5. Check periodically -- if empty, remove and
replace.
DANGER
• IF SWALLOWED, call physician immediately.
Do not induce vomiting. If inhaled, remove to
fresh air. In case of eye or skin contact, flush
with water for 15 minutes.
• Store unopened cartridges in a cool, dry,
well-ventilated area. Keep open cartridge in
fuel cap, and fuel cap closed on fuel tank when
not in use.
Contents are HARMFUL OR FATAL IF
SWALLOWED. Avoid contact to eyes,
skin, or clothing. Do not take internally.
Avoid breathing the mist or vapor.
Overexposure to eyes or skin can
cause irritation. KEEP STABILIZER
OUT OF THE REACH OF CHILDREN.
Fuel stabilizer is a hazardous
chemical.**
• In case of emergency, contact a physician
immediately and call 1-800-424-9300 for material
safety information.
** Fuel stabilizer contains: 2,6-di-tert-butylphenol
(128-39-2) and aliphatic petroleum distillate
(64742-47-8).

15
Engine 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. See Emission Warranty..
Follow the instructions and
schedules indicated below:
Unintentional sparking can result in fire or
electric shock.
Fire or explosion can cause severe burns
or death.
Unintentional start-up can result in
entanglement, traumatic amputation, or
laceration.
• 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.
Before performing maintenance or repairs:
• Disconnect spark plug wire and keep it away
from spark plug.
• Disconnect battery at negative terminal (only
engines with electric start).
• Use only correct tools.
When testing for spark:
• Use approved spark plug tester.
• Do not check for spark with spark plug removed.
WARNING
Check Valve Clearance
Task
Perform task at hourly or
calendar interval,
whichever comes first.
Check Oil Level
Service Air Cleaner*
Clean Air Cooling System***
Inspect Spark Arrester (if equipped)
Change Oil **
Change Oil Filter (if equipped)**
Replace Spark Plug
Replace In--line Fuel Filter (if equipped)
Clean Debris*
* Clean more often under dusty conditions or when airborne debris is present. Replace air cleaner, if very dirty.
** Change oil after first 5 to 8 hours of use, then every 50 hours. Change oil every 25 hours when operating the
engine under heavy load or in high temperatures.
*** On string trimmer applications clean debris at each refueling, sooner if needed and have qualified technician clean
air cooling system every 30 hours, every season, or sooner if needed especially in high debris conditions.

16
Air Cleaner
All engines have an air cleaner cartridge. The cartridge
is either flat or oval. In addition, some engines have a
pre--cleaner. Do not use pressurized air or solvents to clean
cartridge. Pressurized air can damage cartridge;
solvents will dissolve cartridge.
CAUTION
Removing and Installing Flat Air Cleaner
Flat Air Cleaner
SCREW
COVER
BASE
CARTRIDGE CARTRIDGE LIP
A
SSEMB
L
ESOC
A
RTRIDGE
L
IP TOUCHES
BASE IN DIRECTION SHOWN
PRE-CLEANER LIP
TABS AND SLOTS
PRE-CLEANER
P/N 493537
1. Loosen screw, tilt cover down and remove air
cleaner.
2. Install clean (or new) air cleaner assembly inside
cover. Lip of pre--cleaner (if equipped) must be at
bottom of cartridge pleats.
3. Insert cover tabs into slots in bottom of base.
4. Tilt cover up into place and tighten screw.
Removing and Installing Oval Air Cleaner
Oval Air Cleaner
ASSEMBLE SO THAT CARTRIDGE
LIP SITS INSIDE BASE
2 SCREWS
COVER
BASE
CARTRIDGE
P/N 690610
PRE-CLEANER
P/N 273356
5. Loosen two screws and lift off cover.
6. Remove air cleaner assembly (pre--cleaner, if
equipped, and cartridge) from base.
7. Install clean (or new) air cleaner assembly in
base. Air cleaner must fit securely in base.
8. Place cover over air cleaner.
9. Tighten screws.
Ensure air cleaner, retainer, and cover are
properly installed before starting engine.
WARNING
Spark Plug
Check the spark plug every 100 hours. Replace the
spark plug if upon inspection the electrode is burned or
worn. Ensure the spark plug is clean. Check the gap
with a feeler gage and reset to .020 (0.51 mm) if
necessary. Use only Briggs & Stratton Spark Tester
(part number 19368) to check for spark.
Note: In some areas, local law requires using a resistor
spark plug to suppress ignition signals. If this engine
was originally equipped with a resistor spark plug, use
same type for replacement.
.020” (0.51 mm)
WIRE GAGE

17
Cleaning Debris
Daily or before every use, clean accumulated debris
from engine. Keep linkage, spring and controls clean.
Keep area behind muffler free of any combustible
debris.
On string trimmer applications, clean accumulated
debris at each refueling, sooner if needed.
Do not use water to clean engine parts. Water could
contaminate fuel system. Use a brush or dry cloth.
CAUTION
CLEAN CLEAN
Finger Guard
CLEAN CLEAN
Linkage, Springs,
Controls
CLEAN
Muffler
Fuel System
Replacing In--line Fuel Filter (if equipped)
Disconnect spark plug wire and keep away from spark
plug.
Drain Fuel tank or close fuel shut--off valve before
replacing fuel filter. Otherwise, fuel can leak out creating
a fire/explosion hazard.
FUEL FILTER
FUEL HOSE CLAMPS
Replacement parts for fuel system (cap, hoses,
tanks, filters, etc.) must be the original parts, other-
wise fire can occur.
WARNING
Muffler
If muffler is equipped with spark arrester screen,
remove screen for inspection. Replace screen if
damaged or plugged.
Replacement parts for muffler must be the same
and installed in the same position as the original
parts, otherwise fire can occur.
WARNING
Air Cooling System
Over time debris may accumulate in cylinder cooling
fins and cannot e observed without partial engine
disassembly. For this reason, we recommend that you
have an authorized Briggs & Stratton Service Dealer
clean the air cooling system per recommended intervals
(See Maintenance Schedule). Equally important is to
keep top of engine free from debris. See cleaning
debris below.
Engine parts should be kept clean to reduce the risk
of overheating and ignition of accumulated debris.
WARNING

18
Storage
Equipment stored with fuel can become stale when
stored over 30 days. Stale fuel causes acid and gum
deposits to form in fuel system or on essential
carburetor parts. Mix fuel stabilizer with fuel in tank or
storage container. Run engine for a short time to
circulate stabilizer through carburetor and engine.
Engine and fuel can be stored up to 24 months.
If fuel stabilizer is not used, you need to drain
gasoline from equipment prior to storage.
If the FRESH START continuous fuel preserver fuel cap
(concentrated liquid cartridge) is used, there is no need
to drain fuel, as long as cartridge contains stabilizer for
seasonal storage.
Perform the following before long-term storage of
equipment.
1. While engine is still warm, change oil.
2. Remove spark plug and pour about 1/2 oz (15ml)
of engine oil into spark plug cavity which puts oil
into cylinder. Replace spark plug securely.
3. Pull starter rope slowly. This turns the engine’s
crankshaft and distributes oil through the engine.
4. Add fuel stabilizer or drain fuel from engine.
5. Clean dirt and chaff from engine, cylinder head
fins, blower housing and rotating screen areas.
6. Store in a clean, dry area.
Do not store engine 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.
WARNING
Service
See an Authorized Briggs & Stratton Service Dealer for
all your engine service needs. 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 Briggs & Stratton, you
are assured of highly skilled,
reliable engine service at more
than 30,000 Authorized Service
Dealers worldwide, including
more than 6,000 Master
Service Technicians. Look
for these signs wherever
Briggs & Stratton service is
offered.
You may find the nearest Authorized Service Dealer in
our dealer locator map at ww.briggsandstratton.com or
by calling 1-800-233-3723.
PARTIAL LIST OF
GENUINE BRIGGS & STRATTON
PARTS
PART PART NO.
Flat Air Cleaner Cartridge 491588 --OR-- 5043........
Flat Air Cleaner Pre--cleaner 493537................
Oval Air Cleaner Cartridge 697029..................
Oval Air Cleaner Pre--cleaner 273356................
Oil ....... ..100005 --OR-- 100028.................
Synthetic Oil 1000074............................
Fuel Filter 298090 --OR-- 5018.....................
Gas Additive 5041................................
Resistor Spark Plug 491055........................
Spark Plug Wrench 89838.........................
Spark Tester 19368...............................
Oil Pump Kit 5056................................
(uses standard electric drill to remove oil from engine
quickly.)
An illustrated shop manual includes common
specifications and detailed information covering
adjustment, tune-up and repair of Briggs & Stratton
single cylinder, 4 cycle engines. It is available for
purchase from an Authorized Briggs & Stratton Service
Dealer or you can order it from www.briggsandstratton.com
Briggs & Stratton Engines Are Made Under One Or More Of The Following Patents: Design D-247,177 (Other Patents Pending)
6,691,683
6,647,942
6,622,683
6,615,787
6,617,725
6,603,227
6,595,897
6,595,176
6,584,964
6,557,833
6,542,074
6,520,141
6,495,267
6,494,175
6,472,790
6,460,502
6,456,515
6,382,166
6,369,532
6,356,003
6,349,688
6,347,614
6,325,036
6,311,663
6,284,123
6,263,852
6,260,529
6,242,828
6,239,709
6,237,555
6,230,678
6,213,083
6,202,616
6,145,487
6,142,257
6,135,426
6,116,212
6,105,548
6,347,614
6,082,323
6,077,063
6,064,027
6,040,767
6,014,808
6,012,420
5,992,367
5,904,124
5,894,715
5,887,678
5,852,951
5,843,345
5,823,153
5,819,513
5,813,384
5,809,958
5,803,035
5,765,713
5,732,555
5,645,025
5,642,701
5,628,352
5,619,845
5,606,948
5,606,851
5,605,130
5,497,679
5,548,955
5,546,901
5,445,014
5,503,125
5,501,203
5,497,679
5,320,795
5,301,643
5,271,363
5,269,713
5,265,700
5,243,878
5,235,943
5,234,038
5,228,487
5,197,426
5,197,425
5,197,422
5,191,864
5,188,069
5,186,142
5,150,674
5,138,996
5,086,890
5,070,829
5,058,544
5,040,644
5,009,208
4,996,956
4,977,879
4,977,877
4,971,219
4,895,119
4,875,448
4,819,593
4,720,638
4,719,682
4,633,556
4,630,498
4,522,080
4,520,288
4,512,499
4,453,507
4,430,984
D 476,629
D 457,891
D 368,187
D 375,963
D 309,457
D 372,871
D 361,771
D 356,951
D 309,457
D 308,872
D 308,871

19
Engine Specifications
All the components used to build this engine
assembly must remain in place for the proper
operation of this engine.
CAUTION
We recommend that you use an authorized Briggs &
Stratton Service Dealer for all maintenance and service
of the engine and engine parts. Use only genuine
Briggs & Stratton parts.
General Information
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
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, Type and Code Number
To get replacement parts or technical assistance in the
future write your engine Model, Type and Code number
along with the date of purchase here. These numbers
are located on your engine. For the location, see
page 3, Engine Features.
Model Series
Type
Code
Model Series 110000
Bore 2--11/16 in. (68.26 mm).......................
Stroke 1--51/64 in. (46.00 mm).....................
Displacement.............10.20cu.in.(167.4 cc)
Model Series 120000
Bore 2--11/16 in. (68.26 mm).......................
Stroke 2--3/64 in. (52.00 mm)......................
Displacement.............11.58cu.in.(189.7 cc)
Tune up Specifications
Armature air gap 0.006 -- 0.014 in. (0.15 -- 0.36 mm)..
Spark plug gap 0.020 in. (0.51 mm).................
Valve clearance with valve springs installed and piston 1/4
in. (6 mm) past top dead center (check when engine is
cold). Consult with an Authorized Dealer or repair
manual.
Intake 0.004 -- 0.006 in. (0.10 -- 0.15 mm)............
Exhaust 0.004 -- 0.008 in. (0.10 -- 0.20 mm)..........
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°.
Technical Information
Power Ratings: The power ratings for an individual
engine model are initially developed by starting with
SAE (Society of Automotive Engineers) code J1940
(Small Engine Power & Torque Rating Procedure)
(Revision 2002-05). Given both the wide array of
products on which our engines are placed, and the
variety of environmental issues applicable to operating
the equipment, it may be that the engine you have
purchased will not develop the rated horsepower when
used in a piece of power equipment (actual “on-site”
power). This difference is due to a variety of factors
including, but not limited to, the following: differences in
altitude, temperature, barometric pressure, humidity,
fuel, engine lubrication, maximum governed engine
speed, individual engine to engine variability, design of
the particular piece of power equipment, the manner in
which the engine is operated, engine run-in to reduce
friction and clean out of combustion chambers,
adjustments to the valves and carburetor, and other
factors. The power ratings may also be adjusted based
on comparisons to other similar engines utilized in
similar applications, and will therefore not necessarily
match the values derived using the foregoing codes.

20
Emission Information
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.
The Emissions 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.
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
Category B = 250 hours
Category A = 500 hours
For engines of 225 cc or more displacement.
Category C = 250 hours
Category B = 500 hours
Category A = 1000 hours.