Briggs & Stratton Micro Engines Service & Repair Manual

Micro Engine Repair Manual For Briggs & Stratton Discount Parts Call 606-678-9623 or 606-561-4983 www.mymowerparts.com

GENERAL INFORMATION Section 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DISASSEMBLY AND REPAIR Section 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TABLE OF CONTENTS I

SECTION CONTENTS II 1 Section 1 General Information In The Interest Of Safety Briggs & Stratton Numerical Identification System Engine Identification Fuel and Oil Recommendations Gasoline Lubrication Maintenance Check Oil Change Oil Air Cleaner Breather Check Valve Replace Spark Plug Cooling System Troubleshooting Systematic Check Check Ignition Check Carburetion Check Compression Equipment Affecting Engine Operation Hard Starting, Kickback or Will Not Start Vibration Power Loss 2 Section 2 Disassembly and Repair General Information Rewind Assembly Inspect Starter Rope Remove Blower Housing – Direct Drive Engine Replace Starter Rope Install Blower Housing – Direct Drive Engine Remove Blower Housing – Clutch Drive Engine Install Blower Housing – Clutch Drive Engine Ignition Coil Remove Coil Install Coil Adjust Air Gap Flywheel Remove Flywheel – Direct Drive Engine Install Flywheel – Direct Drive Engine Remove Flywheel – Clutch Drive Engine Install Flywheel – Clutch Drive Engine Fuel Tank Remove Fuel Tank Install Fuel Tank Cylinder Head Remove Cylinder Head Install Cylinder Head Muffler Replace Muffler Carburetor Remove Carburetor Install Carburetor Idle Speed Adjustment

1 Section 1 General Information Section Contents Page IN THE INTEREST OF SAFETY 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM 4 . . . . . . . . . . . . . . . . . . . . . . . . . ENGINE IDENTIFICATION 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FUEL AND OIL RECOMMENDATIONS (Gasoline, Lubrication) 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . MAINTENANCE 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Oil 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Change Oil 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Cleaner 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replace Spark Plug 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cooling System 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TROUBLESHOOTING 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Systematic Check 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Ignition (With Engine Starter) 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Ignition (Engine Running) 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Carburetion 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check Compression 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Affecting Engine Operation 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hard Starting, Kickback or Will Not Start 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vibration 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Loss 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Briggs & Stratton engine is made of the finest material in a state-of-the-art manufacturing facility. Please understand that Briggs & Stratton sells engines to original equipment manufacturers. It also sells to others in the distribution chain who may sell to the ultimate consumer, an equipment manufacturer, another distributor or a dealer. As a result, Briggs & Stratton does not necessarily know the application on which the engine will be placed. For that reason, carefully read and understand the operating instructions of the equipment before you repair or operate. Y ou should also understand that there are equipment applications for which Briggs & Stratton does not approve the use of its engines. Briggs & Stratton engines are not to be used on vehicles with less than 4 wheels. This includes motor bikes, aircraft products and All Terrain Vehicles. Moreover, Briggs & Stratton does not approve of its engines being used in competitive events. FOR THAT REASON, BRIGGS & STRATTON ENGINES ARE NOT AUTHORIZED FOR ANY OF THESE APPLICATIONS. Failure to follow this warning could result in death, serious injury (including paralysis) or property damage. IN THE INTEREST OF SAFETY 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.

2 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. Moving Parts HAZARD SYMBOLS AND MEANINGS Explosion Toxic Fumes Shock Hot Surface Kickback Fire 4Prior to work, read and understand the section(s) of this manual that pertain to the job. Follow all safety warnings. 4WEAR suitable eye protection (safety glasses, goggles or face shield when performing repair pro- cedures). 4PREVENT ACCIDENTAL STARTING by removing spark plug wire from spark plug when servicing engine or equipment. 4PERIODICALLY clean engine. Keep carburetor parts free of dirt, grass and other debris which can affect engine speed. 4USE fresh gasoline. Stale fuel can gum carburetor and cause leakage. 4CHECK fuel lines and fittings frequently for cracks or leaks. Replace if necessary. 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 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 STORING GASOLINE OR EQUIP- MENT 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.

3 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. 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. 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. • When starting engine, pull cord slowly until resistance is felt, then pull rapidly. • Direct coupled equipment components such as, but not limited to, blades, impellors, pulleys, sprockets, etc., must be securely attached. 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. WARNING

4 YOUR KEY TO THE WORLD’S FINEST ENGINES This chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine most of the important mechanical features of the engine by merely knowing the model number. Here is how it works: A. The first one or two digits indicate the approximate CUBIC INCH DISPLACEMENT. B. The first digit after the displacement indicates the BASIC DESIGN SERIES, relating to cylinder construction, ignition, general configuration, etc. C. The second digit after the displacement indicates ORIENTATION OF CRANKSHAFT. D. The third digit after the displacement indicates TYPE OF BEARINGS, and whether or not the engine is equipped with REDUCTION GEAR or AUXILIARY DRIVE. E. The last digit indicates the TYPE OF STARTER. BRIGGS & STRATTON MODEL NUMBERING SYSTEM FIRST DIGIT AFTER DISPLACEMENT SECOND DIGIT AFTER DISPLACEMENT THIRD DIGIT AFTER DISPLACEMENT FOURTH DIGIT AFTER DISPLACEMENT A B C D E CUBIC INCH DISPLACEMENT BASIC DESIGN SERIES CRANKSHAFT ORIENTATION PTO BEARING, REDUCTION GEAR, AUXILIARY DRIVE, LUBRICATIONă TYPE OF STARTER ă6 ă8 ă9 10 11 12 13 16 18 19 20 21 22 23 24 25 28 29 30 31 32 35 38 40 42 43 44 46 47 52 54 58 0 1 2 3 4 5 6 7 8 9 A to Z 0 to 4 - Horizontal Shaft 5 to 9 - Vertical Shaft A to G - Horizontal Shaft H to Z - Vertical Shaft 0 - Plain Bearing/DU NonĆFlange Mount 1 - Plain Bearing Flange Mounting 2 - Sleeve Bearing Flange Mounting Splash Lube 3 - Ball Bearing Flange Mounting Splash Lube 4 - Ball Bearing Flange Mounting Pressure Lubrication 5 - Plain Bearing Gear Reduction (6 to 1) CCW Rotation Flange Mounting 6 - Plain Bearing Gear Reduction (2 to 1) CCW Rotation 7 - Plain Bearing Pressure Lubrication 8 - Plain Bearing Auxiliary Drive (PTO) Perpendicular to Crankshaft 9 - Plain Bearing Auxiliary Drive Parallel to Crankshaft A - Plain Bearing Pressure Lubrication Without Oil Filter 0 - Without Starter 1 - Rope Starter 2 - Rewind Starter 3 - Electric Starter Only 110 or 230 Volt Gear Drive 4 - Electric Starter/110 or 230 Volt Gear Drive with Alternator 5 - Electric Starter Only 12 or 24 Volt Gear Drive 6 - Alternator Only 7 - Electric Starter 12 or 24 Volt Gear Drive with Alternator 8 - Vertical Pull Starter or Side Pull Starter 9 - Mechanical Starter A - Electric Starter 12 or 24 Volt Gear Drive with Alternator and Inverter EXAMPLE - To identify Model 303447: 30 3 4 4 7 30 Cubic Inch Design Series 3 Horizontal Shaft Ball Bearing Flange Mounting Pressure Lubrication Electric Starter 12 or 24 Volt Gear Drive with Alternator TYPE 1234Ć01 , The type number identifies the engines mechanical parts, color of paint, decals, governed speed, and Original Equipment Manufacturer. CODE 01061201 , The code is the manufacturing date and is read as follows: YEAR MONTH DAY ASSEMBLY LINE AND MANUFACTURING PLANT 01 06 12 01 Revised 5/03

5 ENGINE IDENTIFICATION 1. Carburetor 2. Stop switch 3. Rope handle 4. Fuel fill 5. Air cleaner 6. Choke lever 7. Spark plug 8. Fuel return hose 9. Fuel intake hose 10. Primer bulb 11. Engine Model Type Code xxxxxx xxxx xxxxxxxx 12. Oil fill / dipstick 13. Fuel tank 1 7 10 4 13 5 2 3 6 8 9 11 12 FUEL AND OIL RECOMMENDATIONS Gasoline These engines are certified to operate on unleaded gasoline. Use clean, fresh, regular unleaded gasoline with a minimum of 85 octane. Do not mix oil with gasoline. Fresh fuel prevents gum from forming in fuel system or on essential carburetor parts. Purchase fuel in quantity that can be used within 30 days to assure fuel freshness. We recommend the use of Briggs & Stratton Gasoline Additive. (See your Authorized Briggs & Stratton Service Dealer for Part No. 5041 or the single-use pouch.) In countries other than U.S.A., leaded gasoline may be used if it is commercially available and unleaded is unavailable. NOTE: Some fuels, called oxygenated or reformu- lated gasolines, are gasoline blended with alcohols or ethers. Excessive amounts of these blends can damage the fuel system or cause performance problems. Do not use gasoline containing Methanol. If any undesir- able operating symptoms occur, use gasoline with a lower percentage of alcohol or ether. Lubrication Oil has four purposes. It cools, cleans, seals and lubricates. During normal operation, small particles of metal from the cylinder walls, pistons, bearings and combustion deposits will gradually contaminate the oil. Dust particles from the air also contaminate the oil forming an abrasive mixture which can cause wear to all of the internal moving parts of the engine, if the oil is not changed regularly. Fresh oil also assists in cooling. Old oil gradually becomes thick and loses its cooling ability as well as its lubricating qualities. Oil Recommendations Use a high quality detergent oil classified “For Ser- vice SF, SG, SH, SJ” or higher. Briggs & Stratton strongly recommends the use of synthetic oil such as Briggs & Stratton (#100030C) or equivalent. If synthetic oil is not available, Briggs & Stratton non- synthetic 30 weight oil is an acceptable substitute. No special additives should be used with recom- mended oils. Do not mix oil with gasoline.

6 SAE VISCOSITY GRADES °C -30 STARTING TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE °F -20 0 20 40 60 80 100 -20 -10 0 10 20 30 40 ** 32 * Air cooled engines run hotter than automotive engines. Use of non-synthetic multi-viscosity oils (10W-30, etc.) in ambient temperatures above 40° F (4° C) will result in high oil consumption. If multi-viscosity oil is used, check oil level more frequently to prevent engine damage due to lack of lubrication. ** SAE 30 oil, if used below 40° F (4° C), will result in hard starting and possible engine damage due to inadequate lubrication. Note: Synthetic oil meeting ILSAC GF-2, API certification mark and API service symbol (shown at left) with “SJ/CF ENERGY CONSERV- ING” or higher, is an acceptable oil at all temperatures. Use of synthetic oil does not alter required oil change intervals. MAINTENANCE If you perform any maintenance on the engine, first disconnect the spark plug wire from the spark plug 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 Maintenance Schedule Daily 10 Hours or Every Season 25 Hours or Every Season 50 Hours or Every Season Check oil level 4 Change oil 4* Service air filter 4** Replace spark plug 4 * Change oil after first 4 hours of use, then every 8 hours or every season. Change oil every 4 hours when operating the engine under heavy load or in high temperatures. ** Clean more often under dusty conditions or when airborne debris is present. Replace air cleaner parts, if very dirty. Check Oil 1. Place the warm engine with the dipstick facing up. If necessary use a support (2) to level the engine, Fig. 1. NOTE: The engine MUST be level to obtain an ac- curate oil level measurement. 2. Unscrew the dipstick (1) and wipe it with a rag. 3. Replace the dipstick, thread the dipstick in completely. 4. Unscrew the dipstick to check the oil. Fig. 1  

Briggs & Stratton Micro Engines Service & Repair Manual

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