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Engine starts but misfires?

2003 Yamaha 135 HP waverunner engine misfires. Start Ok. Replaced spark plugs and fuel filter. Some improvement but still misfiring
Tom, April 2007
take the fly wheel off and give the CDI units a bl**dy good clean with sand paper and clean the pick ups on the CDI units clean the inside of the fly wheel too and WD40 everything so its water tight

graemedixon34@msn.com, April 2007
hey i have the same problem waht to do?!

kasper, April 2007
Ignition lead/s ?

no-one, April 2007
link Click here to see other fixes for Yamaha.