Question about 2002 Harley Davidson XL 1200 C Sportster Custom

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What causes it to flood out and die

My 02 sportster will idle great but when you move the throttle it acts like it floods it out and dies,do you have a suggestion?

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Are you running a carb? If so then check to make sure the choke is fully off, also check to make sure that the vent hose from the carb isn't blocked, and also check your gas tank cap. The easy way to do this is to crack it open like you are going to take it off but just enough so that there is no restriction of air into the gas tank. Leave the cap on the tank. Start it and see what she does. Sometimes what acts like flooding out is actually fuel starvation

Also, how old is the gasoline that you are using? If it's over a month old drain it and put in fresh.
Has your bike sat without running for some time? If yes then the carb could be junky and need cleaning.
Have you put any aftermarket parts on it? If you have changed the exhaust pipes, the carb needs to be tuned to the new pipes and if you went to a K & N style airfilter that is going to mean carb tuning as well.

Another thing is to check for vacuum leaks on the back side of the carb to intake manifold, and intake manifold to the heads. Spray bottle with water will cause the engine to react with either a increase in RPM or a decrease in RPM at idle

If anybody has been into the carb then you may have an internal vacuum leak in the carb itself.

Check all the simple stuff first and go from there.

Posted on May 13, 2014


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Posted on Jan 02, 2017

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SOURCE: i own a 2000 harley sportster 1200 and its dying

Clean the carbs. Sounds like the main jet is plugged up.

Posted on Mar 30, 2009

SOURCE: harleydavidson sportster motorcycle

check the spark plugs ,if they are of the correct specification for the engine.
Best would be to replace them .

Hope this helps

Knight. (yamaha XJ750R seca. 1981

Posted on Apr 17, 2009

  • 59 Answers

SOURCE: 2001 883 harley sportster will start and idle but

If it has been stored for an extended period of time I would pull the carburetor and just rebuild it being you have already changed out the fuel.

Posted on Jul 08, 2009

  • 2030 Answers

SOURCE: 1982 harley davidson sportster XLH . Lost

You need to tear the motor down, sounds as if the pistons seized or you broke a connecting rod, or bearings went out.

In any case you need to have someone that knows what they are doing check it out for you.

Posted on Nov 08, 2009

  • 301 Answers

SOURCE: 2003 Harley Davidson XL 1200 C Sportster

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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