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Repair guides and support for motorcycles manufactured by Yamaha Motor Company.

engine bad sound problem

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Can you describe the noise? Is it a knock, tick, rattle, or grinding sound, and does it happen at idle, under load, or all the time? That will help narrow it down.

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it almost sounds like an electrical spark discharge, but the engine seems to be running without hesitation.

My other thought would be the piston hitting a valve - that would be rather serious.

I can't think of anything else to cause that noise.

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