2015 Kawasaki KX250F Owners Manual - Page 182

TROUBLESHOOTING GUIDE 181 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 oil level too high • Engine oil viscosity too high • Engine bearing worn or damaged • Crankshaft Drive chain trouble • 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 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 adjusted 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 j