8-2
STARTING FAILURE/HARD STARTING/POOR IDLE SPEED
PERFORMANCE/POOR MEDIUM-AND HIGH-SPEED PERFORMANCE
TRBL
SHTG
COMPRESSION SYSTEM
Cylinder and cylinder head
Loose spark plug
Loose cylinder head or cylinder
Faulty cylinder head gasket
Worn, damaged or seized cylinder
Improperly sealed valve
Improper valve-to-valve seat contact
Improper valve timing
Faulty valve spring
Piston and piston ring
Improperly installed piston ring
Worn, fatigued or broken piston ring
Seized piston ring
Seized or damaged piston
Crankcase and crankshaft
Improperly seated crankcase
Seized crankshaft
EB901000
POOR IDLE SPEED PERFORMANCE
POOR IDLE SPEED PERFORMANCE
Carburetor
Improperly returned starter plunger
Loose pilot jet
Clogged pilot air jet
Improperly synchronized carburetors
Improperly adjusted idle speed
(throttle stop screw)
Improper throttle cable free play
Flooded carburetor
Electrical system
Faulty battery
Faulty spark plug
Faulty ignitor unit
Faulty pickup coil
Faulty ignition coil
Valve train
Improperly adjusted valve clearance
Air filter
Clogged air filter element
EB902000
POOR MEDIUM-AND HIGH-SPEED PERFORMANCE
POOR MEDIUM-AND HIGH-SPEED PERFORMANCE
Refer to “STARTING FAILURE/HARD STARTING”. (Fuel system, electrical system, compression
system and valve train)
Carburetor
Faulty diaphragm
Improperly adjusted fuel level
Clogged or loose main jet
Air filter
Clogged air filter element
Fuel pump
Faulty fuel pump
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