2015 Kawasaki KX250F Owners Manual - Page 180

TROUBLESHOOTING GUIDE 179 TROUBLESHOOTING GUIDE ○This troubleshooting guide is not exhaustive and does not give every possible cause for each problem listed. It is meant simply as a quick guide to assist you in troubleshooting for some of the more common difficulties. Starting failure or difficulties - NOTE Engine does not turn over: Valve seized Valve lifter seized Cylinder or piston seized Crankshaft seized Connecting rod small end seized Connecting rod big end seized Camshaft seized Transmission gear or bearing seized Kick shaft return spring broken Kick ratchet gear not engaging Improper installation of vehicle-down sensor Spark missing or weak: Spark plug dirty, broken, or gap improperly adjusted Spark plug cap or high-tension wiring defective Spark plug cap not contacting properly Spark plug type incorrect Crankshaft sensor defective ECU defective Ignition coil defective Engine stop button wiring defective Flywheel magneto damaged Wiring shorted or interrupted j cleaner element clogged, poorly sealed, or not • Air installed plug loose • Spark Cylinder insufficiently tightened • Cylinder head bolt loose • Cylinder or piston worn • No valve clearance • Crankshaft oil seal leak • Valve spring broken or weak • Valve not seating properly (valve bent, worn, or • carbon accumulation on the seating surface) ring worn, weak, broken, or sticking • Piston Piston ring side clearance excessive • Cylinder head gasket damaged • Compression low: Fuel/air mixture incorrect: Fuel does not flow: No fuel in tank Fuel tank cap air vent obstructed Fuel line clogged Break down of a fuel pump Break down of a upstream injector and/or downstream injector