2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 418Get this manual
16-34 APPENDIX Troubleshooting Guide
Fuel to injector insufficient (DFI) Fuel tank air vent obstructed Fuel line clogged Fuel pump trouble (DFI) Injector clogged Throttle body assy loose Throttle body assy gasket damaged Fuel line clogged Fuel pump operates intermittently Inlet air temperature sensor trouble Throttle sensor trouble Inlet air pressure sensor trouble Compression low: Spark plug loose Cylinder head not sufficiently tightened down No valve learance Cylinder, piston worn Piston ring bad (worn, weak, broken, or stic king) Piston ringgroove clearance excessive Cylinder head gasket damaged Cylinder head warped Valve spring broken or weak Valve not seating properly (valve bent, worn, or carbon accumulation on the seating urface Knocking: Carbon built up in combustion chamber Fuel poor quality or incorrect Spark plug incorrect IC igniter CU trouble Camshaft position sensor trouble Crankshaft sensor trouble Ignition coil trouble Inlet air temperature sensor trouble Miscellaneous: Throttle valve won't fully open Engine overheating Engine oil level too high Engine oil viscosity too high Air uction valve trouble Camshaft cam worn Engine oil viscosity too high Lubrication inadequate: Engine oil level too low Engine oil poor quality or incorrect Oil cooler incorrect: Oil ooler clogged Sensor incorrect: Water temperature sensor broken