Engine

Cylinder(s) and cylinder head(s)

• Loose spark plug

• Loose cylinder head or cylinder

• Damaged cylinder head gasket

• Worn or damaged cylinder

• Incorrect valve clearance

• Improperly sealed valve

• Incorrect valve-to-valve-seat contact

• Incorrect valve timing

• Faulty valve spring

• Seized valve Piston(s) and piston ring(s)

• Improperly installed piston ring

• Damaged, worn or fatigued piston ring

• Seized piston ring

• Seized or damaged piston

Air filter

• Improperly installed air filter

• Clogged air filter element Crankcase and crankshaft

• Improperly assembled crankcase

• Seized crankshaft

FUEL SYSTEM Fuel tank

• Clogged fuel filter

• Clogged fuel tank drain hose

• Deteriorated or contaminated fuel Fuel pump

• Faulty fuel pump

• Faulty fuel pump relay Throttle body(-ies)

• Deteriorated or contaminated fuel

ELECTRICAL SYSTEMS Battery

• Discharged battery

• Blown, damaged or incorrect fuse

• Improperly installed fuse Spark plug(s)

• Incorrect spark plug gap

• Incorrect spark plug heat range

• Fouled spark plug

• Worn or damaged electrode

• Worn or damaged insulator

• Faulty spark plug cap

Ignition coil(s)

• Cracked or broken ignition coil body

• Broken or shorted primary or secondary coils

• Faulty spark plug lead

Ignition system

• Faulty crankshaft position sensor

STARTING FAILURE/INCORRECT ENGINE IDLING SPEED/ POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE

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