Kawasaki KX250F - Owner's Manual - page 181
180
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Fuel/air mixture incorrect:
•
Air cleaner element clogged, poorly sealed, or not
installed
•
Fuel contaminated with water or foreign matter
•
Fuel tank cap air vent obstructed
•
Throttle body assy holder loose
•
Air cleaner duct loose
•
Fuel line clogged
•
Fuel pump defective
Compression low:
•
Spark plug loose
•
Cylinder head insufficiently tightened
•
Cylinder bolt loose
•
Cylinder or piston worn
•
No valve clearance
•
Valve spring broken or weak
•
Valve not seating properly (valve bent, worn, or
carbon accumulation on the seating surface)
•
Piston ring worn, weak, broken, or sticking
•
Piston ring side clearance excessive
•
Cylinder head gasket damaged
•
Cylinder head warped
•
Cylinder gasket damaged
•
Decompression trouble
Improper acceleration:
•
Throttle valve does not fully open
•
Air cleaner element clogged
•
Fuel contaminated with water or foreign matter
•
Brake dragging
•
Clutch slipping
•
Engine overheating
•
Engine oil level too high
•
Engine oil viscosity too high
•
Crankshaft bearing worn or damaged
•
Drive chain trouble
Knocking:
•
Carbon built up in combustion chamber
•
Fuel quality poor or type incorrect
•
Spark plug type incorrect
•
ECU defective
Engine overheating -
Firing incorrect:
•
Spark plug dirty, broken, or gap improperly ad-
justed
•
Spark plug type incorrect
•
ECU defective
Fuel/air mixture incorrect:
•
Throttle body assy holder loose
•
Air cleaner element clogged, poorly sealed, or not
installed
•
Air cleaner duct poorly sealed
Compression high:
•
Carbon built up in combustion chamber
Engine overloaded:
•
Brake dragging
•
Clutch slipping
•
Engine oil level too high
•
Engine oil viscosity too high
•
Drive chain trouble