Altitude questions.
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3rd Gear
Joined: Sep 2020
Posts: 7
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From: Colorado
I live in Albuquerque, same elevation as Denver. The stock CV carburetors that were installed on that era Harleys run fine at this elevation. Changing the jetting will help improve the performance, especially if you open up the intake and exhaust, but it shouldn't be running poorly with stock jetting.
That's a fifteen year old bike, I suspect that some of the passages and the jets may be gunked up with gas that's gone to varnish, especially if the previous owner has let it sit for a long periods of time. How many miles are on it?
Another thing that can happen with CV carbs that have been sitting is that the slide diaphragm can stiffen up and get slightly brittle and then develop tiny cracks or pin holes in them. If air can get through the diaphragm it will run poorly.
The last thing I can think of would be a hole in the float. Those babies really need to float, not sink.
If it was mine I'd check all that and probably do a rebuild before chasing down jetting problems.
Good luck with it.
That's a fifteen year old bike, I suspect that some of the passages and the jets may be gunked up with gas that's gone to varnish, especially if the previous owner has let it sit for a long periods of time. How many miles are on it?
Another thing that can happen with CV carbs that have been sitting is that the slide diaphragm can stiffen up and get slightly brittle and then develop tiny cracks or pin holes in them. If air can get through the diaphragm it will run poorly.
The last thing I can think of would be a hole in the float. Those babies really need to float, not sink.
If it was mine I'd check all that and probably do a rebuild before chasing down jetting problems.
Good luck with it.
Banned
Joined: Dec 2014
Posts: 21,413
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Clogged main jet. Replace it and all other jets. Replace petcock and fuel filter.
a new or rebuilt carburetor doesnt cost much more than a do it yourself rebuild kit.
a new or rebuilt carburetor doesnt cost much more than a do it yourself rebuild kit.
Last edited by user 7172984932; Nov 13, 2020 at 10:16 AM.
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