Trouble with Harley Carburetor

Q: I have a 1999, 1200 Sportster and install a carb kit but still can’t start bike after it warms up. Tried adjusting mixing valve but not having any success. Can you give me any tips what to do ? Thanks Dean

A: Did this problem previously exist? What did the Harley carburetor kit consist of and what did you address? What happens when you use the enrichener? Will the bike run without the enrichener? Start it cold and check for an intake leak. Make sure you have no trouble codes in your speedo head. It may not be a fuel issue. It can be a bad sensor.


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14 Responses to “Trouble with Harley Carburetor”
  1. MAD MIKE

    I had the same issue with my 1998 XLH1200. Would not start after it was warmed up. After it cooled down awhile it would start right up. Turned out it was the ignition module. Replaced it and haven’t had an issue since. Word

    Reply
  2. Ralph

    Try this . Check starter ! I know its not the same but had an older ( excuse my French ) Goldwing and found it was the starter , when hot it would not in NO Way start after a short ride , starter got warm and BAM ! I hope this helps .

    Reply
  3. Anthony

    Having trouble with mixture. Screw on top of myn 89 fxr still pops and no top end its acting rough

    Reply
  4. RM

    I had this issue with my 1988 FLHTC and it was a bad connector. I was sure that it was related to the carb. I did also discover an intake leak (S&S Super E). Once I got both of those fixed she runs like a new bike.

    Reply
  5. Max Hall

    I need some HELP. Recently bought a 1990 softtail and tried to start it after its been storage for 4-6 years. as the engine cranks over and fires there’s a stream of oil coming from the hole in the round plate that the air filter is attached to. what’s causing this and how do I fix it/ there is an oil line coming from the back of the oil pump that goes directly to this location.
    Thanks, Max Hall

    Reply
    • Customer Service Techs

      Hi, Max. While your bike sat, oil sumped to the bottom of the crank case; it now needs to be evacuated. You have a bottom breathing motor and it “breathes”, or vents, through the oil line that is routed to your air cleaner assembly. The excess oil will exit from this, bottom breathing, vent line. Remove the oil line from the back of your air cleaner backing plate. Make an extension, so you can run this line downward and into an oil drain pan or container. Verify that you have enough oil in your oil tank and let this m/c run for a little while. This will evacuate the rest of the lingering, old, oil. After this is resolved, be sure to change your oil & filter. http://www.fixmyhog.com/post/tag/sump/

      Reply
  6. pelekeboy

    Hello, I have a 2003 Sportster 883 XLH. I start my bike when it’s cold with no issues. I ride it and when i get home I try restarting it and will not start. I checked coil and it is properly working, checked carb and fuel flowing good in the body throttle, battery brand new and fully charged, spark plugs cleaned and properly gap, there is spark. Once bike cools down it has no problem starting and runs great. Any help will be appreciated. Thank you.

    Reply
  7. C Dennis

    Vike starts and will run for may e a mile then rapid power loss and quits. Won’t restart cor at least 10 min.if at all. Once it sits over night will do the same thing.Any suggestions

    Reply
  8. C Dennis

    Have a 99XL Custom that has an 03 1200 motor. Bike will start up and run fine. Takes off like ah raped ape. But less than a mile down the road it will lose power in a flash & die. Takes sitting for anywhere from 10min. to over night to be able to restart olny to repeat the prosess. A d ideas

    Reply
    • Customer Service

      Dear C Dennis,

      Thank you for your patience. In regards to your question-

      Need to start by determining if your issue is electrical or fuel related.
      When the bike dies, do you lose headlight? If so, you need to start @ the battery, battery cables, or ignition switch.
      If it is losing spark, it may be a bad coil, power to coil, or ignition.
      If fuel related, check for possible vapor lock, a collapsed fuel line, or a bad petcock.
      https://www.fixmyhog.com/video/harley-davidson-ignition-coil-test-008707/
      https://www.fixmyhog.com/video/how-to-search-fix-my-hog-008641/

      Sincerely,

      Mark
      Fix My Hog Video Membership

      Reply
    • Customer Service

      Hi C Dennis. You need to start by determining if your issue is electrical or fuel related.
      When the bike dies, do you lose headlight? If so, you need to start @ the battery, battery cables, or ignition switch.
      If it is losing spark, it may be a bad coil, power to coil, or ignition.
      If fuel related, check for possible vapor lock, a collapsed fuel line, or a bad petcock.
      https://www.fixmyhog.com/video/harley-davidson-ignition-coil-test-008707/
      https://www.fixmyhog.com/video/how-to-search-fix-my-hog-008641/
      Thanks
      Mark-FMH

      Reply
      • C Dennis

        Thanks I’ll check the lights when I reinstall the carb in the morning.the cap is venting, and the coul tests within spec. Have put new fuel lines ,inline filter .taken tank off drained, cleaned& used air to see if the filter on the petcock might be cloged but air flows out easily. Was going to attempt to isolate the ignition with a jumper as soon as I can pick up the ends Id need to make one.if none of that proves out whats wrong I may just sell this one and try again with another. Im about to that point with it.

        Reply