Question about 2004 Harley Davidson XL 883C Sportster Custom

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My 04 883 custom runs fine but pops and back fires when you let off the throttle i have gone through it and cleaned and examined everything but still does it

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  • www_opie277 Jul 21, 2009

    when i bought the bike the kid had different pipes and a windforce air cleaner on it but he did not rejet it. I but stock aircleaner and pipes back on and have been rideing it for a few mounths with no troubles. I checked and it does have the correct jets for a stock bike. The only thing i found wrong with the bike is one spart plug had alot of build up on it and replaced both with new



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Popping on deceleration is a sign of a lean fuel mixture. Could be a pipe change and now you should rejet the carbs or remap the fuel injection, could be it was set lean at the factory to pass emissions. Could be an airbox modification (unlikely). Could be a Fuel Nanny or other gizmo improperly set or malfunctioning.

Posted on Jul 21, 2009

  • Dick
    Dick Jul 21, 2009

    The next thing I would check is the timing. An air leak somewhere in your intake system can also cause a lean mixture.



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