Vintage and Classic Hondas

cb750 running very rich

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TOOLS1

Re: cb750 running very rich

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It should be light brown/tan in color. Can't really tell from the camera angle, but it looks black, and sooty in the picture. Definitely rich. Has that main jet been drilled? Try replacing it with one from another carb.
TOOLS

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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
South of Eden (Kansas City MO)

Lucky 1

Re: cb750 running very rich

In reply to this post by TOOLS1

The 1977 has adjustable needles.

On a Roadstar Adventure.

Lucky 1

Re: cb750 running very rich

In reply to this post by hood624

My recommendation:

Make sure all 4 mixture screws have good O rings with washer and springs.
Take them all out and make sure . Look down inside with a LED pocket flashlight and make sure
there is not anything "extra" down in there.

#120 main jets.
#42 idle jets.
2nd notch (down from the top) on the slide needles.

****From the top!

Mixture screws open 1 turn from closed.
Close them gently till they stop and back them out one full turn.

Make sure that if it has the accelerator pump and nozzles, that they all squirt fuel.

Just make sure all the slides are fully closed and each one opens
as soon as you start to turn the throttle. Do not use a drill bit!
And LAST sync the carbs by using the adjuster nuts on top of the slides.

You do know about the choke right?
Operated by a cable.

No mention of the accelerator pump or spray nozzles.

On a Roadstar Adventure.