Vintage and Classic Hondas

1980 CB750F carburetor issue after rebuild

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fojekl

1980 CB750F carburetor issue after rebuild

Hello,
I have a 1980 CB750F that I just finished rebuilding most of the carbs with a kit from K&L. Everything on the carbs looks fine and is clean. Floats appear to be OK too along with everything else.
When I put the carbs back in the bike I can get it started with some throttle, but when giving the bike some gas it remains "bogged" down and does not response at all to full throttle or partial throttle. The jets are stock sizes, but new. No modifications to any part of the carbs or airbox has been done.
I am wondering if I have a leaking cyclinder or something else going on besides the carbs??

Any suggestions. I have had the carbs out of the bike three times now and do not see any issues with the carbs, but the bike definitely runs the same and carb adjustments are made according to manual.

Kevin

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Re: 1980 CB750F carburetor issue after rebuild

Administrator

Welcome to the forum. it sounds like, you either have a vacuum leak, or the main jet is plugged.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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matakky

Re: 1980 CB750F carburetor issue after rebuild

In reply to this post by fojekl

Hi Kev,
I have just done exactly the same to my 1982 cb750f, i had the same problems to and i found that my accelerator pump diaphram was buggered, replaced that, and i had a vaacum leak between carbs and engine, i replaced the rubbers and made sure they were clamped nice and tight. Problem solved!

Good luck tho, carbs are a real pain in the a**!!!!!

mat.