1979 Harley Davidson XLH 1000 Sportster Logo
Anonymous Posted on Jul 29, 2011

Hello! I've been working on a starting issue with

  • Anonymous Jul 29, 2011

    Amendment: The motorcycle starts well.
    Now it's constantly idling high.

  • Anonymous Jul 29, 2011

    There's three screws on it that I can see: a flat head screw towards the rear of the carb which appears to control the throttle cable, a big phillips head screw at the middle which controls the air flow (I think), and a flat head screw at the front that appears to control the gas flow. If I start adjusting them from completely closed, where should they be set at? Thanks for the help!

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1 Answer

Anonymous

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  • Master 4,565 Answers
  • Posted on Jul 29, 2011
Anonymous
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You are not getting fuel into the carb or at least that is what it sounds like. You said that when it stops, "it doesn't shoot any fuel from the needle in the carb air intake area". You didn't mention what type of carb is on the engine. I'm going to assume that it's the original stock Keihin butterfly type carb. If it squirts fuel and then the engine stops and it no longer squirts fuel, this indicates that the float bowl is dry. You could take the float bowl off immediately and see how much fuel is actually in the bowl. Then with the bowl off of the carb, turn the fuel petcock on just long enough to verify that the fuel is actually flowing into the bowl. On the front face of the carb are four holes. Three of them are for the bolts that hold the air filter to the carb. The fourth hole is the float bowl air vent. Make sure that this hole is not blocked and is open so air can vent out of the float bowl. Also, try leaving your fuel cap off the fuel tank and try it. The tank vent is in the fuel cap and if it's stopped up, not a lot of fuel will flow from the tank before a vacuum builds in the tank and stops the fuel flow. Good Luck finding a shop that will work on your Shovelhead. Most dealers will not work on them and fewer and fewer independant shops will mess them anymore. For more help with you Shovelhead, contact me directly at [email protected]

Good Luck
Steve

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1 Related Answer

Anonymous

  • 4565 Answers
  • Posted on Jul 29, 2011

SOURCE: Where exactly on the motorcycle can one find a

The fuel strainer is on the petcock and is up inside the tank. What does the inside of the carburetor look like? If the plastic strainer on the petcock is gummed up, the carburetor will be as well unless it was drained before it was allowed to sit up.

Good Luck
steve

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Question edited for clarity and add maker.
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Where exactly on the motorcycle can one find a fuel strainer for a 1979 Harley Davidson FXEF Fat Bob 1200? I think it's gummed up from standing gas and I would like to clean it. Thanks for helping!

The fuel strainer is on the petcock and is up inside the tank. What does the inside of the carburetor look like? If the plastic strainer on the petcock is gummed up, the carburetor will be as well unless it was drained before it was allowed to sit up.

Good Luck
steve
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Hello there! I have a 1979 Harley-Davidson FXEF 1200 that isn't starting. I have replaced the battery and the spark plugs and it still won't start. Once in awhile the pistons get combustion but...

If the bike has been sitting for six months, the fuel that was in the float bowl probably evaporated. When it does this, it leaves behind a gummy substance that is actually the additives that the refineries add to the fuel for various purposes. The problem is that it has probably plugged up the jets in the carb. You need to take the carb off the engine, disassemble it completely, and soak it in professional grade carb cleaner. If you don't have the mechanical knowledge to do this, I'd suggest that you take it to someone that does. If the carb is a stock carb, it's a Keihin butterfly type carb and they can be very finnicky about the float needle setting.

Good Luck
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