Question about 2003 Harley Davidson FLSTF Fat boy

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Back firing lose of power when hot - 2003 Harley Davidson FLSTF Fat boy

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There are 3 likely causes for this problem.

  1. A Fuel Line is to close to the cylinder and is pre heating the fuel causing Vapor Lock. This Then results in the motor dying.
  2. A Faulty Coil will present as you describe. The motor will continue to run poorly but the problem will resolve if you shut down the bike and let it cool down.
  3. A Faulty Ignition Module will present as you describe. The motor will continue to run poorly but the problem will resolve if you shut down the bike and let it cool down.
I think your problem will be found in #2 or #3.

Posted on Jun 29, 2009


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