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Thread: backfire

  1. #1
    Join Date
    Aug 2011

    Default backfire

    what causes a motorcycle to backfire when leting off the gas

  2. #2
    Join Date
    Jan 2007


    Hi spoke 246,

    An exhaust leak where the pipe meets the head can cause this. It's probably the most common cause, and the easiest to fix. A lean mixture can also do it. On some bikes, like California off-road bikes equipped with air injection (to meet EPA standards), it's kind of an inherent problem.

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