Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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I have a 2000 Harley Davidson XL Custom Sportster. The bike starts right up, idles fine and runs fine until I hit about 3000 rpm, I start getting backfires. I notice it more when it is cold but it seems to be getting a little worse. Any suggestions?? This is my first bike and don't know a whole lot about them.

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  • rbhi69 Oct 05, 2010

    Thanks.... is this something I should take in to have done??

  • rbhi69 Oct 05, 2010

    I also have a K&N filter on the bike. A buddy of mine seems to think all I need to do is clean the filter, but it sounds to me like it is a little more than that.

  • rbhi69 Oct 05, 2010

    Thanks for your help!! Very much appreaciated!

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There are a few things that it could be. Most likely the timing is off a little. Or not advancing properly. That is more than likely what is wrong. It may also be that the valves were set a little tight, but it will usually backfire at lower rpm's also. So I would bet that your timing is not advancing properly.

Posted on Oct 05, 2010

  • Rodney Clark
    Rodney Clark Oct 05, 2010

    I would take it in and have the timing set. If you don't have a timing light then you won't be able to set it. I would for sure clean the filter also. A dirty air filter will cause lack of power. Backfiring is a timing issue. Or valve issue.

  • Rick Camp
    Rick Camp Jan 29, 2012

    What was wrong with your bike? Mine is doing the same thing

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Please check tge CB points. May be it needs a bit of adjustment.

Posted on Oct 05, 2010

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