2015 Kawasaki KX250F Owners Manual - Page 184

TROUBLESHOOTING GUIDE 183 Engine noise abnormal Knocking: Carbon built up in combustion chamber Fuel quality poor or type incorrect Spark plug type incorrect Engine overheating ECU defective chain, sprocket, chain guide worn • Camshaft spring broken • Decompression Flywheel magneto loose • Abnormal drive train noise housing/friction plate clearance excessive • Clutch Clutch housing gear excessive • Metal chip jammed in clutch housing gear teeth • Transmission noise: Crankcase bearing worn or damaged Transmission gear worn or chipped Metal chip jammed in gear teeth Engine oil level or viscosity too low Kick ratchet gear not properly disengaging from kick gear Kick shaft idle gear worn or chipped Clutch noise: j Piston slap: Piston clearance excessive Cylinder or piston worn Connecting rod bent Piston pin or piston pin holes worn Valve noise: clearance incorrect • Valve Valve spring broken or weak • Camshaft bearing • Valve lifter worn or cam face worn • Other noise: Connecting rod small end clearance excessive Connecting rod big end clearance excessive Piston ring worn, broken or stuck Piston seized or damaged Cylinder head gasket leaking Exhaust pipe leaking at cylinder head Crankshaft runout excessive Engine mounts loose Crankshaft bearing worn Primary gear worn or chipped Camshaft chain tensioner defective Drive chain noise: Drive chain slack improperly adjusted Drive chain worn Rear and/or engine sprocket(s) worn Drive chain inefficiently lubricated Rear wheel misaligned Frame noise abnormal Front fork noise: Oil level or viscosity too low Spring broken or weak Front fork air pressure high