Simplicity 083152-1204-F1 User manual

Foreword

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

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

trained in and are familiar with the servicing procedures for these products, including the proper use of

required tools and safety equipment and the application of appropriate safety practices. Persons untrained

or unfamiliar with these procedures or products should not attempt to perform such work.

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

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

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

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

by Briggs & Stratton.

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

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

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

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

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

for engine technicians.)

• For consumers,

Small Engine and Equipment Maintenance Guide

(p/n CE8155) provides a comprehensive

overview of how small air-cooled engines work, basic troubleshooting, and step-by-step maintenance

procedures.

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

found in the textbook

Small Engines

(p/n CE8020).

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

Authorized Service Dealer.

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

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

prior written permission from Briggs & Stratton Corporation.

This engine repair manual includes the following engine model:

• MODEL 083100

1

SECTION 1 – GENERAL INFORMATION

2

SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS

3

SECTION 3 – TROUBLESHOOTING

4

SECTION 4 – FUEL SYSTEM AND CARBURETION

5

SECTION 5 – CONTROLS AND GOVERNOR SYSTEM

6

SECTION 6 – LUBRICATION SYSTEM

7

SECTION 7 – CYLINDER HEAD AND VALVES

8

SECTION 8 – PISTON, RINGS AND CONNECTING ROD

9

SECTION 9 – CRANKSHAFT, CAMSHAFT AND FLYWHEEL

10

SECTION 10 – CYLINDER AND CRANKCASE COVER

11

SECTION 11 – GEAR REDUCTION UNIT

12

SECTION 12 – STARTER

13

SECTION 13 – EXHAUST SYSTEM

14

SECTION 14 – ENGINE SPECIFICATIONS

SECTION 1 – GENERAL INFORMATION

GENERAL INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Engine Identification - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Acronyms, Abbreviations and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Order of Engine Assembly and Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

3

1

GENERAL INFORMATION

Engine Identification

Engine identification is located as shown (A).

1

Acronyms, Abbreviations and Meanings

MeaningAcronyms and

Abbreviations

Bottom Dead CenterBDC

Before Top Dead CenterBTDC

MagnetoMAG

Part Numberp/n

Power Take-OffPTO

Revolutions Per MinuteRPM

Top Dead CenterTDC

Top No-LoadTNL

Order of Engine Assembly and Disassembly

Section ProcedureSection

Number

Order of Disassembly

Change Oil2Drain oil

Service Spark Plug2Spark Plug

Change Air Filter2Air cleaner assembly

Section ProcedureSection

Number

Order of Disassembly

Remove Control Bracket5Control panel trim

Remove Control Bracket5Governor control bracket

Remove Control Bracket5Air cleaner base

Remove Carburetor4Carburetor

Disassemble Carburetor4Disassemble carburetor

Remove Fuel Tank4Fuel tank

Remove Rewind Starter12Rewind starter

Adjust Armature Air Gap2Blower housing

Remove Muffler13Exhaust manifold

Remove Flywheel9Armature

Remove Flywheel9Flywheel

Remove Breather6Rocker cover / breather

Remove Cylinder Head7Cylinder shield

Disassemble Cylinder Head7Rocker arms

Remove Cylinder Head7Push rods

Remove Cylinder Head7Cylinder head

Disassemble Cylinder Head7Valves, springs and seals

Remove Crankshaft and

Camshaft

9Crankcase cover

Remove PTO Bearing10PTO oil seal

Remove PTO Bearing10PTO bearing

Remove Crankshaft and

Camshaft

9Camshaft and tappets

Remove Piston and

Connecting Rod

8Connecting rod and piston

Remove Crankshaft and

Camshaft

9Crankshaft

Remove MAG Bearing10MAG oil seal

Remove MAG Bearing10MAG bearing

Section ProcedureSection

Number

Order of Assembly

Install MAG Bearing10MAG bearing

Install MAG Bearing10MAG oil seal

Install Crankshaft and

Camshaft

9Crankshaft

Install Piston and Connecting

Rod

8Connecting rod and piston

Install Crankshaft and

Camshaft

9Camshaft and tappets

Install PTO Bearing10PTO bearing

Install PTO Bearing10PTO oil seal

Install Crankcase Cover9Crankcase cover

Assemble Cylinder Head7Valves, springs and seals

Install Cylinder Head7Cylinder head

Install Cylinder Head7Push rods

Install Cylinder Head7Rocker arms

4 BRIGGSandSTRATTON.COM

1

Section ProcedureSection

Number

Order of Assembly

Adjust Valve Clearance2Adjust valve clearance

Install Breather6Rocker cover / breather

Install Cylinder Head7Cylinder shield

Install Flywheel9Flywheel

Install Flywheel9Armature

Adjust Armature Air Gap2Adjust armature air gap

Adjust Armature Air Gap2Blower housing

Install Rewind Starter12Rewind starter

Assemble Carburetor4Assemble carburetor

Install Carburetor4Carburetor

Install Control Bracket5Governor control bracket

Perform Static Governor

Adjustment

2Static governor adjustment

Install Control Bracket5Air cleaner base

Install Fuel Tank4Fuel tank

Install Control Bracket5Control panel trim

Change Air Filter2Air cleaner assembly

Install Muffler13Exhaust manifold

Service Spark Plug2Spark Plug

Change Oil2Fill engine with oil

5

1

6 BRIGGSandSTRATTON.COM

1

SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS

SAFETY INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Safety Alert Symbol and Signal Words - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Hazard Symbols and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

General Safety Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

ENGINE MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Maintenance Schedule - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Fuel Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

High Altitude - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Oil Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Service Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

In-Tank Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

In-Line Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

Change Oil - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

Change Air Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Service Spark Plug - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Clean Air Cooling System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Clean Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

ENGINE ADJUSTMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Adjust Armature Air Gap - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18

Carburetor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Remote Choke and Throttle Controls - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Remote Choke Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Remote Throttle Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Governor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Perform Static Governor Adjustment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Adjust Top No-Load Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Adjust Valve Clearance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

7

2

SAFETY INFORMATION

This repair manual contains safety information that is

designed to:

• Make you aware of hazards associated with engines.

• Inform you of the risk of injury associated with those

hazards.

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

Safety Alert Symbol and Signal Words

The safety alert symbol indicates a potential personal

injury hazard. A signal word (DANGER, WARNING, or

CAUTION) is used with the alert symbol to designate a

degree or level of hazard seriousness. A safety symbol may

be used to represent the type of hazard. The signal word

NOTICE

is used to address practices not related to personal

injury.

DANGER indicates a hazard which, if not avoided,

will

result in death or serious injury.

WARNING indicates a hazard which, if not avoided,

could

result in death or serious injury.

CAUTION indicates a hazard which, if not avoided,

could

result in minor or moderate injury.

NOTICE

addresses practices not related to personal injury.

Hazard Symbols and Meanings

MeaningSymbolMeaningSymbol

Read and understand the

Operator's Manual before

operating or servicing the

unit.

Safety information

about hazards that can

result in personal

injury.

Explosion hazardFire hazard

Explosion hazardShock hazard

Toxic fume hazardHot surface hazard

Chemical hazardAmputation hazard -

moving parts

MeaningSymbolMeaningSymbol

Thrown object hazard -

wear eye protection

Kickback hazard

Amputation hazard -

entanglement

General Safety Messages

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

manual that pertain to the job. Follow all safety warnings.

• Always use fresh gasoline. Stale fuel can cause gum

deposits in the carburetor and cause leakage, flow

restrictions, or other problems.

• Check fuel lines and fittings frequently for cracks or

leaks and replace if necessary.

WARNING

Before attempting to service this equipment, read and

understand this manual and the operating instructions of

the engine and the equipment.

WARNING

Failure to follow instructions could result in serious injury

(including paralysis) and even death.

WARNING

Battery post, terminals, and related accessories contain

lead and lead compounds - chemicals known to the State

of California to cause cancer and reproductive harm. Wash

hands after handling.

WARNING

Certain components in this product and its related

accessories contain chemicals known to the State of

California to cause cancer, birth defects, or other

reproductive harm. Wash hands after handling.

8 BRIGGSandSTRATTON.COM

2

WARNING

Briggs & Stratton Engines are not designed for and are

not to be used to power: fun-karts; go-karts; children's,

recreational, or sport all-terrain vehicles (ATVs);

motorbikes; hovercraft; aircraft products; or vehicles used

in competitive events not sanctioned by Briggs & Stratton.

For information about competitive racing products, see

www.briggsracing.com. For use with utility and

side-by-side ATVs, please contact Briggs & Stratton

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

engine application may result in serious injury or death.

WARNING

The engine exhaust from this product contains chemicals

known to the State of California to cause cancer, birth

defects, or other reproductive harm.

WARNING

Fuel and its vapors are extremely flammable and explosive

which could cause burns, fire or explosion resulting in

death or serious injury.

When Adding Fuel

• Turn engine OFF and let engine cool at least 2 minutes

before removing the fuel cap. Loosen cap slowly to

relieve pressure in tank.

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

• Do not overfill fuel tank. To allow for expansion of the

fuel, do not fill above the bottom of the fuel tank neck.

• Keep fuel 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.

• If fuel spills, wait until it evaporates before starting

engine.

• Do not light a cigarette or smoke.

When Starting Engine

• Ensure that spark plug, muffler, fuel cap and air cleaner

(if equipped) are in place and secured.

• Do not crank engine with spark plug removed.

• If engine floods, set choke (if equipped) to OPEN / RUN

position, move throttle (if equipped) to FAST position

and crank until engine starts.

When Operating Equipment

• Do not operate this product inside any building, carport,

porch, mobile equipment, marine applications, or

enclosure.

• Do not tip engine or equipment at angle which causes

fuel to spill.

• Do not choke the carburetor to stop engine.

• Never start or run the engine with the air cleaner

assembly (if equipped) or the air filter (if equipped)

removed.

When Changing Oil

• If you drain the oil from the oil fill hole (not

recommended), the fuel tank must be empty or fuel can

leak out and result in a fire or explosion.

When Tipping Unit for Maintenance

• When performing maintenance that requires the unit to

be tipped, the fuel tank, if mounted on the engine, must

be empty or fuel can leak out and result in a fire or

explosion.

When Transporting Equipment

• Transport/move/repair with fuel tank EMPTY or with

fuel shutoff valve OFF.

• Do not tip engine or equipment at angle which causes

fuel to spill.

• Disconnect spark plug wire.

When Storing Fuel or Equipment with Fuel In Tank

• Store away from furnaces, stoves, water heaters,

clothes dryers, or other appliances that have pilot light

or other ignition source because they could ignite fuel

vapors.

WARNING

Starting engine creates sparking which could ignite nearby

flammable gases causing explosion or fire resulting in

death or serious injury.

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

start engine.

• Do not use pressurized starting fluids because vapors

are flammable.

9

2

WARNING

POISONOUS GAS HAZARD. Engine exhaust contains

carbon monoxide, a poisonous gas that could kill you in

minutes. You CANNOT see it, smell it, or taste it. Even if

you do not smell exhaust fumes, you could still be exposed

to carbon monoxide gas. If you start to feel sick, dizzy, or

weak while using this product, get to fresh air RIGHT

AWAY. See a doctor. You may have carbon monoxide

poisoning.

• Operate this product ONLY outside far away from

windows, doors and vents to reduce the risk of carbon

monoxide gas from accumulating and potentially being

drawn towards occupied spaces.

• Install battery-operated carbon monoxide alarms or

plug-in carbon monoxide alarms with battery back-up

according to the manufacturer's instructions. Smoke

alarms cannot detect carbon monoxide gas.

• DO NOT run this product inside homes, garages,

basements, crawlspaces, sheds, or other

partially-enclosed spaces even if using fans or opening

doors and windows for ventilation. Carbon monoxide

can quickly build up in these spaces and can linger for

hours, even after this product has shut off.

• ALWAYS place this product downwind and point the

engine exhaust away from occupied spaces.

WARNING

Starter cord kickback (rapid retraction) will pull hand and

arm toward engine faster than you can let go which could

cause broken bones, fractures, bruises, or sprains

resulting in serious injury.

• When starting engine, pull the starter cord slowly until

resistance is felt and then pull rapidly to avoid kickback.

• 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

Rotating parts could entangle hands, feet, hair, clothing,

or accessories resulting in serious injury.

• NEVER operate equipment without protective housing

or covers in place.

• DO NOT wear loose clothing, jewelry or anything that

could become entangled in the equipment.

• Tie up long hair and remove jewelry.

• Keep hands and feet away from rotating parts.

WARNING

Running engines produce heat. Engine parts, especially

mufflers, become extremely hot which could cause severe

thermal burns or catching fire to combustible debris, such

as leaves, grass, brush, etc., resulting in serious injury.

• Allow muffler, engine cylinder and fins to cool before

touching.

• Remove accumulated debris from muffler area and

cylinder area.

• It is a violation of California Public Resource Code,

Section 4442, to use or operate the engine on any

forest-covered, brush-covered, or grass-covered land

unless the exhaust system is equipped with a spark

arrester, as defined in Section 4442, maintained in

effective working order. Other states or federal

jurisdictions may have similar laws. Contact the original

equipment manufacturer, retailer, or dealer to obtain a

spark arrester designed for the exhaust system installed

on this engine.

WARNING

Unintentional sparking could cause fire or electric shock

resulting in death or serious injury.

Unintentional start-up could result in entanglement,

traumatic amputation, or laceration.

Before performing adjustments or repairs:

• Disconnect the spark plug wire and keep it away from

the spark plug.

• Disconnect battery at negative terminal (only engines

with electric start.)

• Use only correct tools.

• Do not tamper with governor spring, links or other parts

to increase engine speed.

• Replacement parts must be of the same design and

installed in the same position as the original parts. Other

parts may not perform as well, may damage the unit,

and may result in injury.

• Do not strike the flywheel with a hammer or hard object

because the flywheel may later shatter during operation.

When testing for spark:

• Use approved spark plug tester.

• Do not check for spark with spark plug removed.

10 BRIGGSandSTRATTON.COM

2

WARNING

Charging batteries produce hydrogen gas which could

cause explosion resulting in death or serious injury.

• Do not store or charge a battery near an open flame or

device that utilizes a pilot light or can create a spark.

WARNING

Damaged, worn, or loose fuel components can leak fuel

which could cause explosion or fire resulting in death or

serious injury.

• All fuel components should be in good condition and

properly maintained.

• Repairs should only be made with factory approved

parts.

• Repair work should be done by a qualified technician.

• Flexible supply lines should be checked regularly to

make sure they are in good condition.

WARNING

Prolonged or repeated contact with used motor oil could

cause injury.

• Used motor oil has been shown to cause skin cancer

in certain laboratory animals.

• Thoroughly wash exposed areas with soap and water.

NOTICE

Failure to follow instructions could result in property

damage.

11

2

ENGINE MAINTENANCE

Maintenance Schedule

First 5 Hours

• Change oil

Every 8 Hours or Daily

• Check engine oil level

• Clean area around muffler and controls

• Clean finger guard

Every 25 Hours or Annually

• Clean air filter *

• Clean pre-cleaner *

Every 50 Hours or Annually

• Check muffler and spark arrester

Every 100 Hours or Annually

• Change engine oil

Annually

• Replace air filter

• Replace pre-cleaner

• Replace spark plug

• Replace fuel filter

• Clean air cooling system *

* In dusty conditions or when airborne debris is present, clean more

often.

Fuel Recommendations

Fuel must meet these requirements:

• Clean, fresh, unleaded gasoline.

• A minimum of 87 octane / 87 AKI (91 RON). For high

altitude use, see below.

• Gasoline with up to 10% ethanol (gasohol) is

acceptable.

NOTICE

Do not use unapproved gasolines, such as E15

and E85. Do not mix oil in gasoline or modify the engine

to run on alternate fuels. Use of unapproved fuels will

cause damage to engine components, which will not be

covered under warranty.

To protect the fuel system from gum formation, mix a fuel

stabilizer into the fuel. See Storage. All fuel is not the same.

If starting or performance problems occur, change fuel

providers or change brands. This engine is certified to

operate on gasoline. The emissions control system for this

engine is EM (Engine Modifications).

High Altitude

At altitudes over 5,000 feet (1524 meters), a minimum 85

octane / 85 AKI (89 RON) gasoline is acceptable.

For carbureted engines, high altitude adjustment is required

to remain emissions compliant. Operation without this

adjustment will cause decreased performance, increased

fuel consumption, and increased emissions. Contact a

Briggs & Stratton Authorized Service Dealer for high altitude

adjustment information. Operation of the engine at altitudes

below 2,500 feet (762 meters) with the high altitude

adjustment is not recommended.

For Electronic Fuel Injection (EFI) engines, no high altitude

adjustment is necessary.

Oil Recommendations

We recommend the use of Briggs & Stratton Warranty

Certified oils for best performance. Other high-quality

detergent oils are acceptable if classified for service SF,

SG, SH, SJ or higher. Do not use special additives.

Outdoor temperatures determine the proper oil viscosity for

the engine. Use the chart to select the best viscosity for the

outdoor temperature range expected.

A SAE 30 Below 40 °F (4 °C) the use of SAE 30 will result in hard

starting.

B 10W-30 Above 80 °F (27 °C) the use of 10W-30 may cause increased

oil consumption. Check oil level more frequently.

C Synthetic 5W-30

D 5W-30

Service Fuel Filter

When the fuel tank is mounted to the engine, refer to

In-Tank Fuel Filter

. When the fuel tank is NOT mounted to

the engine, refer to

In-Line Fuel Filter

.

12 BRIGGSandSTRATTON.COM

2

In-Tank Fuel Filter

1. Drain fuel tank by running engine until fuel tank is

empty.

2. Disconnect the spark plug wire from the spark plug (A).

3. Remove the air filter cover and air filter (B) as instructed

in

Change Air Filter

found in this section.

4. Remove the control panel trim screw (D) and two nuts

(C) from fuel tank.

5. Remove screw from opposite side of fuel tank (E).

6. Lift fuel tank and slide fuel line clamp (F) away from

fuel filter. Remove fuel line (G) with fuel line removal

tool (p/n 19600).

7. Remove fuel filter and o-ring (H) from tank and check

for dirt or debris; clean or replace as necessary.

8. Install cleaned or new fuel filter and o-ring into fuel tank.

Torque fuel filter to the value listed in

Section 14 -

Engine Specifications

.

NOTE: Make sure o-ring is seated in groove of fuel filter.

9. Check the fuel line for cracks or leaks. Replace if

necessary.

10. Install fuel line with clamp onto fuel filter making sure

clamp retains fuel line securely (F, G).

11. Install tank onto engine. Install screw (E), nuts (C) and

control panel trim screw (D). Torque screws and nuts

to the values listed in

Section 14 - Engine

Specifications

.

12. Install the air filter and air filter cover (B) as instructed

in

Change Air Filter

found in this section.

13. Reconnect the spark plug wire to the spark plug (A).

2

3

13

2

In-Line Fuel Filter

1. Drain fuel tank by running engine until fuel tank is

empty.

2. Disconnect the spark plug wire from the spark plug.

3. Slide the clamps (A) away from the fuel filter (C). Twist

and pull the fuel lines (B) off fuel filter. Discard the fuel

filter.

4. Check the fuel lines for cracks or leaks. Replace if

necessary.

5. Install a new fuel filter (C) between fuel lines (B) and

secure with clamps (A). Make sure arrow on fuel filter

points in the direction of fuel flow.

6. Reconnect the spark plug wire to the spark plug.

4

Change Oil

WARNING

Fuel and its vapors are extremely flammable and

explosive.

Fire or explosion can cause severe burns or death.

Running engines produce heat. Engine parts, especially

muffler, become extremely hot.

Severe thermal burns can occur on contact.

• If you drain the oil from the oil fill hole (not

recommended), the fuel tank must be empty or fuel can

leak out and result in a fire or explosion.

• Allow muffler, engine cylinder and fins to cool before

touching.

CAUTION

Avoid prolonged or repeated skin contact with used motor

oil.

• Used motor oil has been shown to cause skin cancer

in certain laboratory animals.

• Thoroughly wash exposed areas with soap and water.

Used oil is a hazardous waste product and must be

disposed of properly. Do not discard with household waste.

Check with your local authorities, service center, or dealer

for safe disposal/recycling facilities.

• Place engine level.

• Clean the oil fill area of any debris.

• See

Section 14 - Engine Specifications

for oil

capacity.

1. Drain fuel tank by running engine until fuel tank is

empty.

2. With engine off but still warm, disconnect the spark plug

wire and keep it away from the spark plug.

3. Clean area around oil fill. Remove oil fill cap/dipstick

(A) and wipe with a clean cloth (B).

4. Remove one of the oil drain plugs located at the base

of the engine (C). Drain the oil into an approved

container.

5. Reinstall the oil drain plug and tighten to the

recommended torque listed in

Section 14 - Engine

Specifications.

6. Slowly pour fresh oil of proper weight and classification

into the oil fill opening (D). Pause to permit oil to settle.

Insert the dipstick; do not turn or tighten.

7. Remove dipstick and wipe clean. Reinsert dipstick but

do not screw it in. Remove dipstick and check the oil

level (E). It should be within the hatch area on the

dipstick. DO NOT overfill.

8. Reinstall dipstick and tighten hand tight.

9. Wipe up any remaining oil.

10. Reconnect the spark plug wire to the spark plug.

14 BRIGGSandSTRATTON.COM

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5

6

Change Air Filter

A correctly serviced air filter protects internal engine parts

from airborne dirt and dust. Poor filter maintenance will allow

dirt and dust to be drawn into the engine, causing wear to

the intake system and contamination of the oil. Dirt in the

oil forms an abrasive mixture which wears down moving

parts.

WARNING

Fuel and its vapors are extremely flammable and explosive

which could cause burns, fire or explosion resulting in

death or serious injury.

• Never start or run the engine with the air cleaner

assembly or the air filter removed.

NOTICE

Do not use pressurized air or solvents to clean

the filter. Pressurized air can damage the filter and

solvents will dissolve the filter.

1. Remove knob (A) from air cleaner cover (B), then

remove air cleaner cover.

2. Remove nut (C) from air filter assembly (D and E) or

(G, H and J), then remove air filter assembly.

3. Remove foam pre-cleaner (E) from air filter cartridge

(D).

4. Gently tap air filter cartridge on a hard surface to loosen

debris. Replace cartridge if very dirty.

5. Wash foam pre-cleaner in warm, soapy water, then

rinse and allow to air dry.

6. Foam Filter (H) Only: Wash the foam element (H) in

liquid detergent and water. Squeeze dry the foam

element in a clean cloth. Saturate the foam element

with clean engine oil. To remove the excess engine oil,

squeeze the foam element in a clean cloth.

7. Assemble dry foam pre-cleaner (E) to air filter cartridge

(D).

8. Install air filter assembly (D and E) or (G, H and J) onto

air cleaner base (F) and retain using the nut (C). Do

not over-tighten.

9. Install air cleaner cover (B) and retain using knob (A).

Do not over-tighten.

15

2

7

Service Spark Plug

NOTICE

Spark plugs have different thread lengths and

heat ranges. When changing a spark plug, use only the

specified replacement or engine damage could occur.

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 the same

type for replacement.

1. Disconnect the spark plug wire.

2. Remove and inspect spark plug for wear and damage.

Replace spark plug if electrodes are burned away or if

the porcelain is cracked.

3. Do not sand-blast or bead-blast the spark plug. Clean

by scraping or wire brushing and then washing in a

commercial solvent.

4. Using a wire gauge, check and set the gap (A) to the

value listed in

Section 14 - Engine Specifications.

8

5. Install spark plug by hand and tighten finger tight. Then

torque to the value listed in

Section 14 - Engine

Specifications.

6. Connect the spark plug wire.

Clean Air Cooling System

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 debris from muffler area and

cylinder area.

NOTICE

Do not use water to clean the engine. Water

could contaminate the fuel system. Use a brush or dry

cloth to clean the engine.

This is an air cooled engine. Dirt or debris can restrict air

flow and cause the engine to overheat, resulting in poor

performance and reduced engine life.

1. Use a brush or dry cloth to remove debris from the air

intake area (A).

2. Keep linkage, springs and controls (B) clean.

3. Keep the area around and behind the muffler (C) free

of any combustible debris.

4. Use a brush, vacuum and/or compressed air to remove

debris from cylinder cooling fins.

After a period of time, debris can accumulate in the cylinder

cooling fins and cause the engine to overheat. This debris

cannot be removed without partial disassembly of the

engine. Have a Briggs & Stratton Authorized Dealer inspect

16 BRIGGSandSTRATTON.COM

2

and clean the air cooling system as recommended in the

Maintenance Schedule.

9

Clean Combustion Chamber

Remove combustion chamber deposits every 500 hours or

whenever the cylinder head is removed.

With the piston at Top Dead Center (TDC), scrape deposits

from top of piston and upper bore with a plastic scraper.

Remove the loosened deposits from around the top ring

land area using compressed air or a shop vacuum and a

soft bristle brush.

NOTICE

Use care to prevent debris from entering the

engine.

Do not damage bore, top of piston, cylinder head or gasket

mounting surfaces.

It is not necessary to remove the discoloration marks on

the piston, valves and/or cylinder head. These marks are

normal and will not affect engine operation.

Storage

Fuel can become stale when stored over 30 days. Stale

fuel causes acid and gum deposits to form in the fuel system

or on essential carburetor parts. To keep fuel fresh, use

Briggs & Stratton® Advanced Formula Fuel Treatment

& Stabilizer, available wherever Briggs & Stratton genuine

service parts are sold.

There is no need to drain gasoline from the engine if a fuel

stabilizer is added according to instructions. Run the engine

for 2 minutes to circulate the stabilizer throughout the fuel

system before storage. If gasoline in the engine has not

been treated with a fuel stabilizer, it must be drained into

an approved container. Run the engine until it stops from

lack of fuel. The use of a fuel stabilizer in the storage

container is recommended to maintain freshness.

17

2

ENGINE ADJUSTMENTS

Adjust Armature Air Gap

1. Disconnect spark plug wire from spark plug. Secure

spark plug wire away from spark plug.

2. Remove air cleaner cover and air filter (A) as instructed

in

Change Air Filter

found in this section.

3. Remove knob (B) from throttle control lever.

4. Remove two nuts (D) and two screws (C) and then

remove the control panel trim from the engine.

5. Remove fuel line (E) from carburetor.

6. Remove four screws (F) that attach the blower housing

to the engine.

10

7. Carefully remove the blower housing from the engine

and set aside.

8. Turn flywheel so magnet is away from armature legs.

9. Loosen two screws (J and K).

10. Slide Armature (H) away from flywheel.

11. Tighten screw (K) to secure Armature.

12. Turn flywheel so magnet is aligned with armature legs

(G).

11

13. Insert a gauge 0.008 - 0.016 in. (0.2 - 0.4 mm) thick

between the flywheel and the armature legs (M).

14. Loosen screw (K). Press the armature legs (H) tight

against the flywheel.

12

15. Torque both screws (J and K) to the value listed in

Section 14 - Engine Specifications

.

16. Rotate flywheel to remove gauge (M).

18 BRIGGSandSTRATTON.COM

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Simplicity 083152-1204-F1 User manual

Simplicity 083152-1204-F1 User manual

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