Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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My 97 1200 Sportster backfires back through the factory cv carb.

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  • Rev Randy
    Rev Randy Oct 25, 2014

    Air , lean the jet ajustment



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Its probable simple it very often is with Harley's I think you may have an engine exhause that may have an air leek, even though you hear no sound from the exhaust that may give you clue, just make sure all carbs/injectors, air box and exhaust's are on tightly go can be as carfull as you like it happens to the best of us even me after 42yrs of bikeing I hope this solves you problem its due to old idears on bikes *** bikes have different methods but its impossble work on them at leat you can repair a Harly, Good luch chum some time you need an artificial sealer dont ask me what.
Regards, Chas

Posted on Mar 05, 2009


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Jun 03, 2016 | Harley Davidson XL 1200 C Sportster Custom...

1 Answer

2000 sportster front cylinder backfires

There is probably a small leak in the intake tube to that cylinder. Remove and carefully inspect and reinstall carb and induction manifold.

Apr 09, 2014 | Harley Davidson XL 1200 C Sportster Custom...

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Hard to start then backfires through carb

Backfire through carb often means timing too advanced.

Mar 13, 2012 | 1993 Harley Davidson XLH Sportster 883...

1 Answer

Backfiring at low rpm through carborator Do you have a dvd or book on this & which is better?

This is quite common these days. The reason it's doing this is because of one or two things. The first thing to check is the accelerator pump. Take the air filter cover and the air filter element off the carb. Leave the air filter backing plate on the engine. With the engine OFF, turn the throttle wide open rather rapidly while looking into the carb. You'll see a brass nozzle standing up just inside the mouth of the carb. When you crank the throttle wide open, there should be a stream of fuel squirted from this nozzle into the carb. If not, the diaphragm in the carburetor's accelerator pump is bad. The other thing is that the bike is jetted extremely lean from the factory so that it meets EPA emission standards. As a result of the lean jetting, the engine will cough back through the carb from time to time. You need to go up one step on the carburetor's slow speed jet and adjust the idle mixture. Either replacing the accelerator pump diaphragm or the rejetting job requires taking the carb off the engine. If you are not comfortable doing this, take it to a professional mechanic. I don't know of any DVD's on how to disassemble and reassemble a Keihin CV carb but you can get a service manual from

Good Luck

Jul 09, 2011 | 2004 Harley Davidson XL 883C Sportster...

1 Answer

My harley 2004 sportster XL883 is starting, but it is backfiring alot and when i try to ride it has no power.

Is it backfiring through carb or exhaust? Has it been sitting for any period of time? We suspect carb issues. Try cleaning carb, pay special attention to the pilot jet and main jet circuits. Clean with spray carb cleaner and air, do not use wire. Make sure needle and seat are clean.

Oct 31, 2010 | 2004 Harley Davidson XL 883 Sportster

1 Answer

99 sportster 883, backfiring

sound's like the carb is set to ritch, ther should be an adjustment on or just under the carb it's self

Jun 05, 2010 | 1993 Harley Davidson XLH Sportster 883

1 Answer

2004 HD sportster. bike sit while deployed for 7 months. Tried to start it and it cranks over and backfires through the exhaust and carb and will not start. Rebuilt carb and changed intake seals. Still...

Make sure firing order is correct for the plugs.Also compression test is easy way to make sure valves are working.was it doing this before rebuild carbs.Thank you for your service, I am greatfull for the FREEDOM!!!!

Apr 20, 2010 | 2004 Harley Davidson XL 1200 C Sportster...

1 Answer

How do i know if i have a cv carb motor or a twin cam

You have a basic EVO designed engine with a CV carb.I dont think they have a TC Sportster yet.

Jan 24, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

How do i know if i have a cv carb motor.

By the year, which in this case is 2000. The factory stopped using the butterfly type on Sportsters somewhere around 1988 I think. But they are defitnely not on the 2000 unless someone has put it on. There also should be sticker on the side of the carby telling you it is a CV and what year. If all that fails take the air cleaner off and have a look down the carby, there should be a slide inside which you can lift upwards. This works of a vaccumn when the engine is running hence the constant velocity "CV"

Jan 24, 2009 | 2000 Harley Davidson XL 1200 C Sportster...

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