Question about 2003 Harley Davidson XL 1200 C Sportster Custom

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2003 Harley Davidson XL 1200 C Sportster It starts and runs perfect when cold.When it warms up to 150 degrees at wide open acts like it is running out fuel,At 180 does it at half throttle and above,At 190 you cant even crack the throttle it dies>let it cool down runs great again

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That's a strange one. The only things I can think of suggesting are:

  • Clogged gas cap vent. The next time is starts running poorly, remove the gas cap briefly and see if things improve. If so, then the cap is not venting as it should.
  • Moisture trapped in float bowl. Drain the contents on the carburetor float bowl into a clean container and check for dirt, rust, water, or anything else that doesn't belong there.
  • Dirty fuel filter. If there is one, replace it.
  • Air leak between carb and engine. Check tightness of clamps and manifolds for cracking. WD-40 sprayed around those areas with the engine idling will help detect any leaks.
That's all I can think of. Please let me know if any of my suggestions fixed it.

Posted on Dec 09, 2009

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