Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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2003 sportster poping with lose of power

Starts fin as engine warms up Starts poping with lose of power. Adjust choke and it disapears for a while and starts.Almost like its running out of gas. Replaced fuel filter and gas line with no difference. Plugs and wires are good.

Posted by Anonymous on

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  • Harley Davidson Master
  • 40,650 Answers

Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Harley Davidson Sportster error codes and how to access them

Posted on May 18, 2015

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Posted on Jan 02, 2017

  • 77 Answers

SOURCE: power loss after warm up

Most certaintly a fuel problem. It sounds to me like you might have a high speed jet a little stopped up. I would pull the carb and clean the jets. If the fuel is a little old, and I do mean a little, and the bike sat a little bit, the carbs probably a little varnished. The gasoline we have no days aint nowhere near what it use to be. Clean carb and all should be well. Also for future referance if you know your gonna let the fuel sit more than a couple weeks, I would use a fuel stabilizer and run the bike a while to make sure the stablelizer gets in the carb.

Posted on Jun 23, 2009

searcher1974
  • 229 Answers

SOURCE: 2003 harley 1200 custom sportster with 50 miles strats up fine with choke pulled out. once engine is warm and choke is pushed in 50% bike stalls out. have repalaced gas, spark plugs and just took ap

A 2003 model with only 50 miles?? Wow....well,since youve already taken the carb apart and cleaned it,did you hook up the vaccum line for the VOES switch on the intake manifold? If so,..when you get the bike running,..spray some brake clean around the intake where it bolts to the heads.If the idle picks up,or starts to sputter,..youve got leaking intake gaskets. Which is a good possibility on a bike that old with that few miles on it.The choke essentailly adds more fuel to the motor,and by what your saying,the bike is obviously running lean. Also,...im ASSUMING that you have fresh gas in it,and the petcock is turned on.

Posted on Sep 25, 2012

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2003 harley 1200 custom sportster with 50 miles strats up fine with choke pulled out. once engine is warm and choke is pushed in 50% bike stalls out. have repalaced gas, spark plugs and just took apart...


A 2003 model with only 50 miles?? Wow....well,since youve already taken the carb apart and cleaned it,did you hook up the vaccum line for the VOES switch on the intake manifold? If so,..when you get the bike running,..spray some brake clean around the intake where it bolts to the heads.If the idle picks up,or starts to sputter,..youve got leaking intake gaskets. Which is a good possibility on a bike that old with that few miles on it.The choke essentailly adds more fuel to the motor,and by what your saying,the bike is obviously running lean. Also,...im ASSUMING that you have fresh gas in it,and the petcock is turned on.

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It sounds like your carburetor is flooding, check to see if the choke is set too tight.
to do this, when the engine is cold, remove the air cleaner assembly, push the gas pedal one time to the floor. in the carburetor throat is a flap, this flap closes as engine cools so the engine receives more fuel for cold weather starts, the flap is at the top of the carb. this flap should have about a 1/8" gap between the throat wall and the flap when it is fully closed, if if is completly closed it will give the engine to much fuel and cause it to flood. if you need to adjust just follow the linkage that the flap is attached to, and it will lead you to the choke housing, this is where you can adjust it.
once this is done start the engine and let it warm up, as it warms up this choke flap should open completly up in a vertical position.
if it doesnt, then you probably have lost power to the choke housing or your heat tube that comes from the exhaust manifold to the choke housing is bent, off or missing. most likely yours will be electric.
i hope this helps, good luck

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