Question about 2002 Harley Davidson XL Sportster 883

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Stage 1 Low rpm backfire

Had open air intake as well as drag exhaust. All changed back to factory. Now at low idle and low speeds when bike is cool in the mornings it will backfire, or spit while going down the road at 30 or 35 mph. Jets? Idle jet? Plugs are new and correct. Air cleaner new. This is an 2002 883 R Harley Davidson.

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  • Anonymous Mar 30, 2014

    only ticks over on slight choke,all jets cleaned /no air leaks/stage 1 tuned

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  • 69 Answers

If you are running straight pipes they might not give you the right back pressure. This can be reolved by either going back to riginal pipes or instaling a bolt into the pipes about 5 inches in to make back pressure. Another thing? Did you have the bike's electronic ignition reset after you messed with it?

Posted on Jun 21, 2009

  • biggdaddy108
    biggdaddy108 Feb 24, 2013

    No i did not reset the ignition, and yeah it has staight pipes.

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firstly thankyou for adding a video allways helps

can u tell me how the bike performs in all revs ?

you say it has been dynoed how long ago ? have you made any changes since ? was it working fine when it left or has it been like it since u got it back from them ?

does it lack power taking off ?

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as for something usefull for now here is a little rule for thigureing out air fuel mixes at low rpm and as a genral rule for setting up any stage of the carb idle mid and high rpm

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