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yz450f weird backfire

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My bike never backfires, one day i was ridding to my friends house and i let off the gas and it was backfiring? *** then i sped up and did the same thing and it didnt backfire. It does this every once in a while. Could it be the hotstart cable like getting stuck or something? it starts on first to third kick every time.

Thanks!

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Mine was doing the same thing. Just had it fixed. Main jet in mine was too big and the carburator needed adjusting. Doesn't do it anymore.

You probably need a carb cleaning.

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