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Old 08-11-2022, 02:29 PM   #1
chazdo2
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Default 1981 Harley gas only runs with squiting gas in carb

Bought a new carb runs great when you squirt gas in the intake. Gaskets are new appears to be sealed up well. gas lines are new and tight new fuel filter. am I looking at crank seals? I read somewhere that if you spray starting fluid or wd 40 by the seals and the rpms pick up its a good test? If not can someone walk me through a leak down test for this engine?
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Old 08-12-2022, 08:40 AM   #2
Leon willis
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Default Re: 1981 Harley gas only runs with squiting gas in carb

If there signs of oily dirt by the crankshaft then it needs seals
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Old 08-12-2022, 08:51 AM   #3
Lochlin
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Default Re: 1981 Harley gas only runs with squiting gas in carb

That "spray something by the seals" has never worked for me. To be honest, I am not sure it's possible to hit the front seal with any spray as it's under the points, flywheel and such. Even with the clutch one, there isn't much room there to get any spray to the seal.

There is a "fuel draw" sticky on top of the forum that you might find helpful. Also, note that with the HDs, there isn't a fuel pump in the truest sense. Instead, there are some diaphragms in the carb that pulse with engine vacuum causing fuel draw. Those go bad. You way want to try rebuilding your carb or getting a new one altogether. They are only made in China at this point so they are cheap but the quality isn't there, obviously.

Regarding a leak down test, I have never done one on a cart because, frankly, it's easy enough just to replace suspect areas one by one until I get things fixed. That said, there are a lot of leak down videos on You Tube that describe how it's done.
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Old 08-13-2022, 07:33 AM   #4
chazdo2
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Default Re: 1981 Harley gas only runs with squiting gas in carb

Thanks again you guys are the best!!!!! Always helpful never condescending !!!Huge help for the less learned!!!!!!!
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