Vintage and Classic Hondas

Mysterious "t-piece" between carbs on '81 CB750K...

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Re: Mysterious "t-piece" between carbs on '81 CB750K...

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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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K. Crisman

Re: Mysterious "t-piece" between carbs on '81 CB750K...

In reply to this post by Ray

I have an 81 CB750C that the fuel diaphragm (vacuum actuated petcock) leaks out the top bad... can the part be bypassed and just rely on turning the manual petcock to "off"?

LukeM

Re: Mysterious "t-piece" between carbs on '81 CB750K...

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In a word, yes. You will need to use the petcock all the time. Just unplug the hose going from the petcock to the fuel vacuum valve, and put it where the output of the fuel vacuum valve goes to. Should be pretty easy to find and to bypass.

I had one on my CB750L, and the only time it was a problem was if the carb bowls were dry. It would take quite a bit of cranking to get enough vacuum pulses to the valve to allow gas to get to the carbs. If I were riding it regularly, there was plenty of gas in the carbs, and starting was less of an issue.

Luke M

Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.

cdaiscool

Re: Mysterious "t-piece" between carbs on '81 CB750K...

Also make sure to block off the vacuum nipple coming off the 2nd carb. I'm doing this to my carbs as well.

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