2003-2005 Kawasaki Ultra-150 Jet Ski Factory Service Manual., Page 282Get this manual
16-16 APPENDIX Troubleshooting
Faulty magneto Battery voltage low
Engine Lubrication System
Oil line clogged Faulty oil pump
Abnormal engine sound During normal cruising
Slight piston seizure Piston ring broken or sticking Main bearing worn or damaged
During sudden acceleration Excessive clearance between connecting rod small end and piston pin, or between pin and piston
Excessive connecting rod big end clearance Ignition timing too advanced Carbon accumulation in cylinder head Poor quality gasoline Spark plug wrong heat range