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TRBL
SHTG
STARTING FAILURE/HARD STARTING/POOR IDLE SPEED
PERFORMANCE/POOR MEDIUM AND HIGH-SPEED PERFORMANCE
COMPRESSION SYSTEM
Cylinder and cylinder head
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Loose spark plug
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Loose cylinder head or cylinder
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Broken cylinder head gasket
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Broken cylinder gasket
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Worn, damaged or seized cylinder
Piston and piston rings
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Improperly installed piston ring
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Worn, fatigued or broken piston ring
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Seized piston ring
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Seized or damaged piston
Valve, camshaft and crankshaft
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Improperly sealed valve
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Improperly contacted valve and valve seat
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Improper valve timing
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Broken valve spring
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Seized camshaft
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Seized crankshaft
POOR IDLE SPEED PERFORMANCE
POOR IDLE SPEED PERFORMANCE
Carburetor
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Improperly returned starter plunger
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Loose pilot jet
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Clogged pilot jet
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Clogged pilot air jet
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Improperly adjusted idle speed
(Throttle stop screw)
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Improper throttle cable play
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Flooded carburetor
Electrical system
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Faulty spark plug
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Faulty CDI unit
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Faulty pickup coil
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Faulty charging/rotor rotation direction coil
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Faulty ignition coil
Valve train
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Improperly adjusted valve clearance
Air filter
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Clogged air filter element
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
POOR MEDIUM AND HIGH-SPEED PERFORMANCE
Refer to “STARTING FAILURE/HARD STARTING” and “POOR IDLE SPEED PERFORMANCE-
VALVE TRAIN”.
Carburetor
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Improper jet needle clip position
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Improperly adjusted fuel level
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Clogged or loose main jet
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Deteriorated or contaminated fuel
Air filter
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Clogged air filter element
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