Starting Failurehard Starting

FUEL SYSTEM PROBABLE CAUSE

• Clogged fuel filter

•Clogged fuel breather hose — «Deteriorated fuel or fuel containing water or foreign material

■•Deteriorated fuel, fuel containing water or foreign material •Clogged pilot jet •Clogged pilot air passage •Sucked-in air • Deformed float •Groove-worn needle valve •Improperly sealed valve seat •Improperly adjusted fuel level •Improperly set pilot jet •Clogged starter jet ■•Malfunctioning starter plunger

•Clogged air filter

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SHTG

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ELECTRICAL SYSTEM

— Switches and wiring-

•Starter motor-

PROBABLE CAUSE -•Improper plug gap •Worn electrodes •Wire between terminals broken •Improper heat range -•Faulty spark plug cap

-•Broken or shorted primary/secondary

• Faulty source coil •Faulty pick-up coil

-•Broken woodruff key

-•Faulty main switch

• Faulty "START" switch

• Faulty "ENGINE STOP" switch

• Faulty "NEUTRAL" switch — »Broken or shorted wiring

-•Faulty starter motor • Faulty starter relay — »Faulty circuit cut-off relay

»Faulty battery

COMPRESSION SYSTEM

•Cylinder and cylinder head-

— Piston and piston rings-

— Crankcase and crankshaft-

PROBABLE CAUSE ■•Loose spark plug

• Loose cylinder head or cylinder

• Broken cylinder head gasket

• Broken cylinder gasket

•Worn, damaged or seized cylinder •Improperly sealed valve •Improperly contacted valve and valve seat •Improper valve timing ■•Broken valve spring

■•Improperly installed piston ring •Worn, fatigued or broken piston ring

• Seized piston ring ■•Seized or damaged piston

• Seized crankshaft

□ •Improperly adjusted valve clearance •Improperly adjusted valve timing

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