2013 Kawasaki KX250F Owners Manual - Page 172

170 TROUBLESHOOTING GUIDE head warped • Cylinder gasket damaged • Cylinder • Decompression trouble Poor low-speed performance Spark weak: Spark plug dirty, broken, or gap improperly adjusted Spark plug cap or high-tension wiring defective Spark plug cap shorted or not contacting properly Spark plug type incorrect Crankshaft sensor defective ECU defective Ignition coil defective Flywheel magneto defective Wiring connector not in good contact Fuel/air mixture incorrect: Air cleaner element clogged, poorly sealed, or not installed Fuel tank cap air vent obstructed Throttle body assy holder loose Air cleaner duct loose 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 not seating properly (valve bent, worn, or • Valve carbon accumulation on the seating surface) ring worn, weak, broken, or sticking • Piston ring side clearance excessive • Piston head gasket damaged • Cylinder head warped • Cylinder gasket damaged • Cylinder • Decompression trouble j Other: ECU defective Brake dragging Clutch slipping Engine overheating Engine oil level too high Engine oil viscosity too high Drive chain trouble Poor or no high-speed performance Firing incorrect: Spark plug dirty, broken, or gap improperly adjusted Spark plug cap or high-tension wiring defective Spark plug cap shorted or not contacting properly Spark plug type incorrect ECU defective Ignition coil defective Crankshaft sensor defective Flywheel magneto defective Wiring connector not in good contact