Micro Engine Repair Manual - Small Engine Suppliers

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for docutech printing12/12/033:24 PMPage 1Micro EngineRepair Manual

TABLE OF CONTENTSGENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 1DISASSEMBLY AND REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section 2I

SECTION CONTENTS12Section 1General InformationIn The Interest Of SafetyBriggs & Stratton Numerical Identification SystemEngine IdentificationFuel and Oil RecommendationsGasolineLubricationMaintenanceCheck OilChange OilAir CleanerBreather Check ValveReplace Spark PlugCooling SystemTroubleshootingSystematic CheckCheck IgnitionCheck CarburetionCheck CompressionEquipment Affecting Engine OperationHard Starting, Kickback or Will Not StartVibrationPower LossIISection 2Disassembly and RepairGeneral InformationRewind AssemblyInspect Starter RopeRemove Blower Housing – Direct Drive EngineReplace Starter RopeInstall Blower Housing – Direct Drive EngineRemove Blower Housing – Clutch Drive EngineInstall Blower Housing – Clutch Drive EngineIgnition CoilRemove CoilInstall CoilAdjust Air GapFlywheelRemove Flywheel – Direct Drive EngineInstall Flywheel – Direct Drive EngineRemove Flywheel – Clutch Drive EngineInstall Flywheel – Clutch Drive EngineFuel TankRemove Fuel TankInstall Fuel TankCylinder HeadRemove Cylinder HeadInstall Cylinder HeadMufflerReplace MufflerCarburetorRemove CarburetorInstall CarburetorIdle Speed Adjustment

1Section 1General InformationSection ContentsPageIN THE INTEREST OF SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1BRIGGS & STRATTON NUMERICAL IDENTIFICATION SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . 4ENGINE IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5FUEL AND OIL RECOMMENDATIONS (Gasoline, Lubrication) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Check Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Change Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Replace Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67778TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Systematic Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Check Ignition (With Engine Starter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Check Ignition (Engine Running) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Check Carburetion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Check Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Equipment Affecting Engine Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Hard Starting, Kickback or Will Not Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Power Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10The 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 thedistribution chain who may sell to the ultimate consumer, an equipment manufacturer, another distributor or adealer. 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 oroperate.You should also understand that there are equipment applications for which Briggs & Stratton does not approvethe use of its engines. Briggs & Stratton engines are not to be used on vehicles with less than 4 wheels. Thisincludes motor bikes, aircraft products and All Terrain Vehicles. Moreover, Briggs & Stratton does not approveof its engines being used in competitive events. FOR THAT REASON, BRIGGS & STRATTON ENGINES ARENOT 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 symbolis used to identifysafety information about hazards that can result inpersonal injury.A signal word (DANGER, WARNING or CAUTION) isused with the alert symbol to indicate the likelihood andthe potential severity of injury. In addition, a hazardsymbol may be used to represent the type of hazard.1

1DANGER indicates a hazard which, if notavoided, will result in death or seriousinjury.WARNING:The engine exhaust from this productcontains chemicals known to the Stateof California to cause cancer, birthdefects, or other reproductive harm.WARNING indicates a hazard which, ifnot avoided, could result in death orserious injury.WARNINGCAUTION indicates a hazard which, if notavoided, might resultmoderate injury.inminororCAUTION, when used without the alertsymbol, indicates a situation that couldresult in damage to the engine.Gasoline and its vapors are extremelyflammable and explosive.Fire or explosion can cause severe burns ordeath.WHEN ADDING FUELHAZARD SYMBOLS AND MEANINGSFireToxic rior to work, read and understand the section(s)of this manual that pertain to the job. Follow all safetywarnings.4WEAR suitable eye protection (safety glasses,goggles or face shield when performing repair procedures).4PREVENT ACCIDENTAL STARTING by removing spark plug wire from spark plug when servicingengine or equipment.4PERIODICALLY clean engine. Keep carburetorparts free of dirt, grass and other debris which canaffect engine speed.4USE fresh gasoline. Stale fuel can gum carburetorand cause leakage.4CHECK fuel lines and fittings frequently for cracksor leaks. Replace if necessary.2 Turn engine OFF and let engine cool at least2 minutes before removing gas cap. Fill fuel tank outdoors or in well-ventilatedarea. Do not overfill fuel tank. Fill tank toapproximately 1-1/2 inches below top ofneck to allow for fuel expansion. Keep gasoline away from sparks, openflames, pilot lights, heat, and other ignitionsources. Check fuel lines, tank, cap, and fittingsfrequently for cracks or leaks. Replace ifnecessary.WHEN STARTING ENGINE Make sure spark plug, muffler, fuel cap andair cleaner are in place. Do not crank engine with spark plugremoved. If fuel spills, wait until it evaporates beforestarting engine. If engine floods, set choke to OPEN/RUNposition, place throttle in FAST and crankuntil engine starts.WHEN OPERATING EQUIPMENT Do not tip engine or equipment at anglewhich causes gasoline to spill. Do not choke carburetor to stop engine.WHEN STORING GASOLINE OR EQUIPMENT WITH FUEL IN TANK Store away from furnaces, stoves, waterheaters or other appliances that have pilotlight or other ignition source because theycan ignite gasoline vapors.

1WARNINGWARNINGUnintentional sparking can result in fire orelectric shock.Unintentional start-up can result in entanglement, traumatic amputation, or laceration.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 ADJUSTMENTSOR REPAIRS Disconnect spark plug wire and keep it awayfrom spark plug.WHEN TESTING FOR SPARK Use approved spark plug tester. Do not check for spark with spark plugremoved.WARNING Allow muffler, engine cylinder and fins to coolbefore touching. Remove accumulated combustibles frommuffler area and cylinder area. Install and maintain in working order a sparkarrester before using equipment onforest-covered, grass-covered, brush-coveredunimproved land. The state of Californiarequires this (Section 4442 of the CaliforniaPublic Resources Code). Other states mayhave similar laws. Federal laws apply onfederal land.WARNINGStarting 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 fluidsbecause vapors are flammable.WARNINGRotating parts can contact or entangle hands,feet, hair, clothing, or accessories.Traumatic amputation or severe laceration canresult. 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, danglingdrawstrings or items that could becomecaught.WARNINGEngines give off carbon monoxide, anodorless, colorless, poison gas.Breathing carbon monoxide can causenausea, fainting or death. Start and run engine outdoors. Do not start or run engine in enclosed area,even if doors or windows are open.Rapid retraction of starter cord (kickback) willpull hand and arm toward engine faster thanyou can let go.Broken bones, fractures, bruises or sprainscould result. When starting engine, pull cord slowly untilresistance is felt, then pull rapidly. Direct coupled equipment components suchas, but not limited to, blades, impellors,pulleys, sprockets, etc., must be securelyattached.3

1YOUR KEY TO THE WORLD’S FINEST ENGINESThis chart explains the unique Briggs & Stratton numerical model designation system. It is possible to determine mostof 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 tocylinder 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 notthe engine is equipped with REDUCTION GEAR or AUXILIARY DRIVE.E. The last digit indicates the TYPE OF STARTER.BRIGGS & STRATTON MODEL NUMBERING SYSTEMAFIRST DIGITAFTER DISPLACEMENTBSECOND DIGITAFTER DISPLACEMENTCCUBIC INCHDISPLACEMENTBASICDESIGN 6789A to ZEXAMPLE - To identify Model 303447:30330 Cubic InchDesign Series 30 to 45 to 9A to GH to Z-Horizontal ShaftVertical ShaftHorizontal ShaftVertical Shaft4Horizontal ShaftTHIRD DIGITAFTER DISPLACEMENTDPTO BEARING,REDUCTION GEAR,AUXILIARY DRIVE,LUBRICATIONă0 - Plain Bearing/DUNonĆFlange Mount1 - Plain BearingFlange Mounting2 - Sleeve BearingFlange MountingSplash Lube3 - Ball BearingFlange MountingSplash Lube4 - Ball BearingFlange MountingPressure Lubrication5 - Plain BearingGear Reduction(6 to 1) CCW RotationFlange Mounting6 - Plain BearingGear Reduction(2 to 1) CCW Rotation7 - Plain BearingPressure Lubrication8 - Plain BearingAuxiliary Drive (PTO)Perpendicular toCrankshaft9 - Plain BearingAuxiliary DriveParallel to CrankshaftA - Plain BearingPressure LubricationWithout Oil Filter4Ball BearingFlange MountingPressure LubricationFOURTH DIGITAFTER DISPLACEMENTETYPE OF STARTER0123-456789A-Without StarterRope StarterRewind StarterElectric Starter Only110 or 230 Volt GearDriveElectric Starter/110 or230 Volt Gear Drivewith AlternatorElectric Starter Only12 or 24 Volt GearDriveAlternator OnlyElectric Starter12 or 24 Volt GearDrive with AlternatorVertical Pull Starter orSide Pull StarterMechanical StarterElectric Starter12 or 24 Volt GearDrive with Alternatorand Inverter7Electric Starter12 or 24 Volt Gear Drivewith AlternatorTYPE 1234Ć01, The type number identifies the engines mechanical parts, color of paint, decals, governed speed, andOriginal Equipment Manufacturer.CODE 01061201, The code is the manufacturing date and is read as follows:YEAR01Revised 5/034MONTH06DAY12ASSEMBLY LINE AND MANUFACTURING PLANT01

1ENGINE rStop switchRope handleFuel fillAir cleanerChoke leverSpark plug128.9.10.11.Fuel return hoseFuel intake hosePrimer bulbEngine Model Type Codexxxxxx xxxx xxxxxxxx12. Oil fill / dipstick13. Fuel tankFUEL AND OIL RECOMMENDATIONSGasolineThese engines are certified to operate on unleadedgasoline. Use clean, fresh, regular unleadedgasoline with a minimum of 85 octane. Do not mix oilwith gasoline. Fresh fuel prevents gum from formingin fuel system or on essential carburetor parts.Purchase fuel in quantity that can be used within 30days to assure fuel freshness. We recommend theuse of Briggs & Stratton Gasoline Additive. (Seeyour Authorized Briggs & Stratton Service Dealerfor Part No. 5041 or the single-use pouch.)In countries other than U.S.A., leaded gasoline maybe used if it is commercially available and unleadedis unavailable.NOTE: Some fuels, called oxygenated or reformulated gasolines, are gasoline blended withalcohols or ethers. Excessive amounts ofthese blends can damage the fuel system orcause performance problems. Do not usegasoline containing Methanol. If any undesirable operating symptoms occur, use gasolinewith a lower percentage of alcohol or ether.13LubricationOil has four purposes. It cools, cleans, seals andlubricates. During normal operation, small particlesof metal from the cylinder walls, pistons, bearingsand combustion deposits will gradually contaminatethe oil. Dust particles from the air also contaminatethe oil forming an abrasive mixture which can causewear to all of the internal moving parts of the engine,if the oil is not changed regularly. Fresh oil alsoassists in cooling. Old oil gradually becomes thickand loses its cooling ability as well as its lubricatingqualities.Oil RecommendationsUse a high quality detergent oil classified “For Service SF, SG, SH, SJ” or higher. Briggs & Strattonstrongly recommends the use of synthetic oil suchas Briggs & Stratton (#100030C) or equivalent. Ifsynthetic oil is not available, Briggs & Stratton nonsynthetic 30 weight oil is an acceptable substitute.No special additives should be used with recommended oils.Do not mix oil with gasoline.5

1Maintenance ScheduleSAE VISCOSITY GRADESDaily** F C-20-30200-20-1032040601080201003040STARTING TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OILCHANGE***Air cooled engines run hotter thanautomotive engines. Use of non-syntheticmulti-viscosity oils (10W-30, etc.) inambient temperatures above 40 F (4 C)will result in high oil consumption. Ifmulti-viscosity oil is used, check oil levelmore frequently to prevent engine damagedue to lack of lubrication.SAE 30 oil, if used below 40 F (4 C), willresult in hard starting and possible enginedamage due to inadequate lubrication.Note: Synthetic oil meeting ILSACGF-2, API certification mark andAPI service symbol (shown at left)with “SJ/CF ENERGY CONSERVING” or higher, is an acceptable oilat all temperatures. Use of synthetic oil does not alter requiredoil change intervals.Checkoil lacesparkplug* Change oil after first 4 hours of use, then every8 hours or every season. Change oil every 4 hourswhen operating the engine under heavy load or inhigh temperatures.** Clean more often under dusty conditions or whenairborne debris is present. Replace air cleaner parts,if very dirty.Check Oil1. Place the warm engine with the dipstick facingup. If necessary use a support (2) to level theengine, Fig. 1.NOTE: The engine MUST be level to obtain an accurate oil level measurement.2. Unscrew the dipstick (1) and wipe it with a rag.3. Replace the dipstick, thread the dipstick incompletely.4. Unscrew the dipstick to check the oil.MAINTENANCE WARNINGIf you perform any maintenance on the engine, firstdisconnect the spark plug wire from the spark plugto prevent unintentional sparking. Unintentionalsparking can result in fire or electric shock.Unintentional start-up can result in entanglement,traumatic amputation or laceration. Use onlycorrect tools. Fig. 16

1BE SURE OIL LEVEL IS PROPERLYMAINTAINED. Always fill to dipstick FULL mark (1),Fig. 2. Fig. 2 Change Oil1. Remove dipstick.2. Invert the engine to drain oil while the engine iswarm.3. Fill engine with 3.0 oz. (88 ml.) of new oil.4. Replace dipstick.Air CleanerFig. 3Breather Check ValveWith the air cleaner removed inspect the breathercheck valve (1), Fig. 4. Remove any obstructionsfrom the check valve. The check valve should beflexible and remain closed as shown.A properly serviced air cleaner protects internalparts of the engine from dust particles in the air. Ifair cleaner maintenance instructions are not carefully followed, dirt and dust that should be collectedin the foam filter will be drawn into the engine.1. Push cover tab to release air cleaner cover (1),Fig. 3.2. Remove filter (2).3. Wash filter in liquid detergent and water.4. Squeeze it dry in a clean cloth.5. Saturate foam air filter in clean engine oil, thensqueeze out excess oil in clean cloth. 6. Install air filter.NOTE: Make sure filter is on outside of locatingbosses and flush with filter base.7. Refer to Breather Check Valve, below.8. Install air cleaner cover.DO NOT use compressed air or solvents to cleanfilter. Compressed air can damage filter; solvents willdissolve filter.Fig. 4Replace Spark PlugReplace spark plug yearly or if electrodes showsigns of wear, or the porcelain is cracked. Set sparkplug gap at .025 inch (.65 mm). Torque spark plug to20 Nm (180 in. lbs.).Briggs & Stratton recommends spark plug number696876 for the Micro Engine.7

1quickest and surest method of determining thecause of failure.Check Ignition (With Engine Starter).025” (0.65 mm)Cooling SystemGrass particles, chaff or dirt can clog the air coolingsystem. Continued operation with a clogged coolingsystem can cause severe overheating and possibleengine damage. This should be a regular maintenance operation, performed yearly. Clean moreoften if necessary.With stop switch in ON/RUN position and spark pluginstalled, attach a #19368 ignition tester to the sparkplug lead and ground the other end of the tester asshown in Fig. 5. Operate the starter a minimum ofsix times in rapid succession. If a strong, steadyspark is observed at the tester gap, you may assumethe ignition system is functioning satisfactorily.NOTE: If spark initially appears at tester, but stopson subsequent pulls and the stop switch isin the ON/RUN position, check for a defective equipment stop switch or shorted wires.TROUBLESHOOTINGMost complaints concerning engine operation canbe classified as one or a combination of thefollowin

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

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