Question about 2005 Harley Davidson XL 1200 C Sportster Custom

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Spark plug What is the proper spark plug setting for a 1999 harley davidson sportster xl 1200 custom?

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The proper air gap is .032 to .036 depending on spark plug brand.

Posted on Nov 20, 2008

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Rough start for HD sportster 1200 xl


Hi Anonymous, and the usual supects are:
1. Spark plugs are in bad condition, improper gap, partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged.
4. Loose wire connection at one of the battery terminals,coil, or plug between the Ignition Control Module.
5. Throttle controls not adjusted correctly.
6. Water or dirt in fuel system/tank
7. Water or dirt in carburator.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricking fuel flow.
10. Inrichner valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition not functioning properly possible faulty CKP, CTS or MAP sensor.
13. Faulty ignition coil.
14. Valves sticking.
For a possible prime suspect please visit the website below and good luck:
Harley Davidson Sportster error codes and how to access them

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Hi Anonymous, the HD 6R12 spark plug is gapped at .040" Have nice day.

Jul 15, 2012 | 2003 Harley Davidson XL 1200 C Sportster...

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Jul 09, 2012 | 2006 Harley Davidson XL 1200 C Sportster...

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How to change spark plugs on a 02 harley sportster 1200 custom ?


With the engine cold, remove the wires from the spark plugs, then use a spark plug socket to remove them. Set the gap on the new plugs at 0.040 (forty thousandths). Give the threads a light coating of anti seize and install the new plugs. Re-install the wires and you are done.

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1 Answer

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Check your pick-up sensor located inside the timing cover,behind the adjustor plate. If the filament is not intact you will have no spark.
A defective coil, cam position sensor, or stator will also cause a no spark condition.

Good luck, i hope this will FixYa and get your bike back on the road.

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2 Answers

Speedo, turn signals, brake lights, horn stopped working. All else is fine.


Gap your plugs to 38 thou. Check all your bulbs (one burned out will affect the rest) Take a look at all your fuses and make sure they are all ok. Otherwise you are probably looking at a wiring short which will require trouble shooting of the elctrical system. Buy your self a service manual for your bike, this will help you a lot.

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What is the sparkplug gap on 2004 883 harley davidson


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Apr 29, 2009 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

Spark plug


The proper air gap is .032 to .036 depending on spark plug brand.

Nov 10, 2008 | Harley Davidson XL 1200 C Sportster Custom...

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