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Thread: CX500 backfires when I let off the throttle

  1. #1

    CX500 backfires when I let off the throttle

    I've posted this in a couple CX500-specific forums, too. Anyway, when I let off the throttle at speed, my CX500 sounds like it's backfiring. The bike has an aftermarket exhaust on it - I don't know if that matters, but I get the impression that bikes are sensitive to exhaust changes. Any idea how I can fix this?
    Matt - '05 Suzuki GS500F
    Motorcycle 4 A Month
    http://madscientistmatt.blogspot.com/
    Quote Originally Posted by LoDownSinner View Post
    Respect doesn't control the motorcycle, skills do.

  2. #2
    Flirting With The Redline nanite's Avatar
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    Backfiring off throttle with a non-stock exhaust usually means that the bike is running too lean.

    When you put a different exhaust on a carbureted motorcycle, like the CX500 which I used to own, you probably have to rejet the bike's carburetor since it's running lean.

    The east fix is to just put the stock exhaust back on.

    Your call.

  3. #3
    An exhaust leak can cause a backfire condition as well. Check where the header pipe connects to the engine (only when the bike is cold), and check where your muffler connects to the header pipe.

    Tom
    2006 Honda VTX1300S

  4. #4
    Flirting With The Redline 2000 Posts! MarcS's Avatar
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    Are we talking rapid popping, or loud, explosive backfires?
    Ia! Ia! Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fh'tagn!

  5. #5
    Thanks. It's more of a rapid popping - I don't think it's spitting fire out the muffler, although I haven't looked too closely.

    And I suspect that rejetting the carb may not be quite as difficult as finding a stock exhaust for a 27 year old bike in good condition.
    Matt - '05 Suzuki GS500F
    Motorcycle 4 A Month
    http://madscientistmatt.blogspot.com/
    Quote Originally Posted by LoDownSinner View Post
    Respect doesn't control the motorcycle, skills do.

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