Question about 2003 Harley Davidson XL 1200 C Sportster Custom

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My bike spits and sputters and dies as soon as u get on throttle. sometimes will start back up but usually has to sit for awhile. acts like running out of gas or flooding out cause can smell gas. when i take plugs out they r dry however air cleaner is saturated. brand new coil, new ecm, new carb and new petcock.

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  • wd4ity
    wd4ity Oct 02, 2010

    Have you changed anything on the exhaust system. If the bike will idle, let it idle and feel the exhaust pulse from each pipe. Do they feel about the same. Are both pipes warming up properly? What kind of carb did you put on the engine?

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  • Harley Davidson Master
  • 40,627 Answers

Hi Mikebecvar, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable especially the negative cable at BOTH ends.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
For a prime suspect please visit website below and good luck:
Harley Davidson Sportster error codes and how to access them

Posted on Jun 07, 2015

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Posted on Jan 02, 2017

ollie reece
  • 1167 Answers

SOURCE: My 99' gsxr 600 won't go past idle.

hi mate im prety sure these bikes have injectors rather than a carb

Posted on Aug 25, 2009

wd4ity
  • 4565 Answers

SOURCE: replaced carb , coil, and

Have you checked you fuel petcock in the tank. These things are vacuum operated and are notorious for giving problems.

Posted on Sep 02, 2010

bdrew1340
  • 448 Answers

SOURCE: 1999 Harley Davidson Sportster 883 with gas in carb it will start and when I turn the petcock to on it floods out with gas coming out of exhaust?

Is the carb float set properly?

Posted on May 30, 2012

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