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Yamaha 2003 800xlt engine failure problem

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  • Yamaha 2003 800xlt engine failure problem

    My 2 cycle jet ski engine fail in one cylinder. The top of the head was very pitted and the plug gap was closed. I could not find any loose metal parts. The piston rings seem to be intact even though it only has 30psi. The failure didn't seem to be cause by running to lean nor a burnt piston. Questions: what happened and how can I prevent this from happening again. I would appreciate any advice or help.
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