20 Most Recent 2003 Harley Davidson XL 1200 C Sportster Custom Questions & Answers

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.

Question edited for clarity. Try this https://www.hdforums.com/forum/ironhead/1182089-ignition-switch-wiring.html More here and on the images tab https://www.google.com/search?q=2003+harley+davidson+sportster+ignition+switch+wiring+diagram ..

You have a short in the start button. Check it out with a multimeter.

Hi, James and the usual suspects are: 1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries. 2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary. 3. Faulty main circuit breaker and or connections. 4. Faulty ignition coil and or connections. 5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator. 6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark. 7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets 8. Burnt exhaust valve or air leak in the exhaust system. 9. Improper valve clearance (too tight). 10. Check for generated diagnostic codes. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. https://www.hdforums.com/forum/sportster-models/48977-xl1200-backfires-through-carb.html http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc https://serviceinfo.harley-davidson.com/sip/content/document/view?id=90016 https://www.6ya.com/ to speak to me personally

Duplicate question already answered

Source It From HereSource It From Here

Source It From HereSource It From HereGreat DatabaseGreat DatabaseGreat DatabaseSource It From HereSource It From Here

Source It From HereSource It From Here

Great DatabaseGreat DatabaseGreat Database

usually the cable is broken, or sender went bad

YOU JUST CHECK THE WIERRING ,IT MUST THE PLUGH INSIDE THE HEADLIGHT WHICH IS REMOVE FOM THE SOCKET... JUST ATTACH AND ENJOY DONT FORGET TO VOTE ME PLS

Can you please provide more information as to the nature of the problems you are experience. The model and year of the bike will also be helpful. Add detail and resubmit the query