Cold backfiring

Discussion in 'Motorbike Technical Discussion' started by Duncan Cooper, Sep 10, 2003.

  1. Recently changed muffs on an XS400. Now the bike backfires when it's
    cold. Almost exclusively when decelerating. Plugs are OK. I'm
    wondering if the difference in backpressure has caused it. I'm no
    tuning expert, and seek the "wisdom of the hive".
    Duncan Cooper, Sep 10, 2003
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  2. Duncan Cooper

    Stevo Guest

    My thinking would be that you have disturbed a seal on the exhaust system
    so,ewhere and it is sucking some air.. if the problem goes away when the
    engine is hot, then the expansion of the metals is closing the opening...
    Stevo, Sep 10, 2003
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  3. That's a reasonable place to start. There is actually a small exhaust
    leak between the header pipe and the left muff.


    Duncan Cooper, Sep 10, 2003
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