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c77 cb750 will not run without choke

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dumbar

c77 cb750 will not run without choke

I have a 77 cb with cleaned carbs that runs fine as long as i leave the choke on.....responds to the throttle, runs smooth. As soon as you release the choke it bogs and stops running. This is without the breather box installed. Is the breather box my problem?

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Re: c77 cb750 will not run without choke

Administrator

It sounds like you have a vacuum leak. I would check the rubber boots.
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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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Re-run

Re: c77 cb750 will not run without choke

Administrator

In reply to this post by dumbar

Well my 78 runs without the box. A little rich set though but it should still idle without the box. He could have an air leak and maybe set lean too.

The ride IS the adventure. The destination is just to get gas!

dumbar

Re: c77 cb750 will not run without choke

By running rich, are you talking about re-jetting or adjusting the mixture screw? I am assuming counterclockwise on the adjustment screw would make it richer, (probably a quarter turn)?

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Subject: Re: c77 cb750 will not run without choke

Well my 78 runs without the box. A little rich set though but it should still idle without the box. He could have an air leak and maybe set lean too.
The ride IS the adventure. The destination is just to get gas!

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