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Thread: backfire

  1. #1
    Join Date
    Aug 2011
    Posts
    1

    Default backfire

    what causes a motorcycle to backfire when leting off the gas

  2. #2
    Join Date
    Jan 2007
    Posts
    4,850

    Default

    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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