1980 shut off when warm
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Stage II
Joined: Jan 2006
Posts: 2
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1980 shut off when warm
My girlfriend's dad has a 1980 Shovelhead that he hasn't cranked in a couple of years. I would like to get it running for him, because he can't afford to get it worked on right now. (Brownie Points yeah?) Anyway, I don't know much about motorcycles, but I do know the basics of an engine as I have a 71 Corvette that I've basically redone. The problem is, after running for a little while and warmed up, the motor shuts off. After a short time, it will start right back up. I'm thinking vapor lock maybe? Is this caused by the carburetor being to lean or am I totally off here? I know it's probably something really simple, just need some help figuring it out as I'm a total rookie at this. Thanks for the help.
Road Captain
Joined: Sep 2005
Posts: 583
Likes: 5
From: Maine
RE: 1980 shut off when warm
If it is vapor lock, look for a fuel filter between the cylinders in the fuel line from the tank to the carb. If there is a fuel filter, remove it. Vapor lock can also be caused by a fuel line that is too close or touching a cylinder.
Another possibility would be a mis-adjusted float causing it to run the bowl dry.
If it is a heat related problem I would look at the stock electronic ignition. The symptoms you describe were common with the early electronic ignitions. If it has been converted to points then I would be suspect of the coil.
Theres a few things you can try. Let us know what you find.
Another possibility would be a mis-adjusted float causing it to run the bowl dry.
If it is a heat related problem I would look at the stock electronic ignition. The symptoms you describe were common with the early electronic ignitions. If it has been converted to points then I would be suspect of the coil.
Theres a few things you can try. Let us know what you find.
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