Question about Harley Davidson FLHRCI Road King Classic Motorcycles

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After riding my bike for a while, it cuts out, and chugs. (vapor-locking?) what can I do?

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You didn't say what year or model the bike is. Your problem could be in the fuel cap. A stopped up cap vent will allow your bike to run about five or so miles then sputter to a stop. Try loosening your fuel cap and ride a ways to see if it does it again. I wouldn't do this with a full tank of fuel or you may have fuel in your lap. Also, if your bike is equipped with a vacuum operated petcock, the diaphragm may be bad. You'll have to take the fuel line and the small vacuum line off the back of the petcock. Drain the tanks but loosening the large nut and allowing the fuel to run out. Catch it with a large funnel and an empty gas can. Remove the petcock from the tank. Remove the four small screws on the backside of the petcock that holds the square plate on. Carefully remove the plate and notice how the parts come out. There's a spring, a needle, and a diaphragm in there. Hold the diaphragm up to the light and gently stretch it while looking for a hole. If you find one replace the diaphragm.

Good Luck

Posted on May 30, 2011


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If the bike dies, immediately remove the gas cap and see if the bike will restart right away.
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Sounds more to me like you are boiling your fuel and vapor locking. I don't know how that bike is set up, but many bikes have one way vent to prevent fuel from spilling in an accident. Has the bike been apart lately? There is insulation on most bikes to protect the tank from excess heat. If it is removed the fuel actually begin to vaporize in the tank and won feed the carb properly.

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What is a Vapor Lock? How to fix it?

Google " vapor lock " and read the wikipedia definition. Your problem could be vapor lock but I think it is a vacuum problem. If no air can get into the gas tank then fuel can't get out. Most gas caps have a vent aspect built into the cap. Ride your bike with the cap loose. If the problem disappears you now know the source.

Can I get a “very helpful” rating on this answer?

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Cub Cadet 2165 with a Briggs & Stratton shuts off when hot. Appears to be vapor lock, as can see fuel filter emptying. After filter cools, it refills. Anyone have a solution?

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