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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2001 xl 1200 Sportster Run and when it warms up it shuts down, after it cools down it will start again and run fine and when it warms up it shuts down again.


Check the cam sensor in the nose cone on the right side of the engine. Due to heating cycles, the epoxy melts over time and the wires don't make contact. Pretty sure replacing it will solve your problem,. You will have to time the bike after replacing the sensor, though.

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2003 harley 1200 sportster won't start when warm tuns over no spark just changed coil no difference starts right away when cold


Hi Curtis, the CKP sensor needs compression to send correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables especially ground cable to frame.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm.
For a prime suspect please visit the website below and good luck.
Harley Davidson Sportster error codes and how to access them

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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check the fittings at the cold start lever on the carb,it might need ajusting,if air filter is chocked it will run rough,

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Nov 02, 2009 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

I have 2000 xlh sportster 1200 the bike idles fine runs fine but will shut off when oil guage reaches a little over 150 degrees any ideas


It sounds electrical and as it's a Sporty, I suggest a temperature-related dry joint opening up in the wiring. One popular candidate would be the earthing strap. It's worth checking continuity with a VOM when engine is hot. It may have a vibration crack. 66C is quite cool for a sportster oil temperature, so I guess you have this problem on every long ride? Good Luck.

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