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Carburetor Information
U.S. CB750 Models 1969-1978
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Repairing 77-78 carb accelerator pump valves - Pg 9
Carefully dop the ball back into teh valve and gently start the retainer with spring in the valve. Use the head of a screwdriver or small hammer to tap the retainer back in unitl it is just flush with the top of the valve. Slow and easy here. Too far and you're back to disassembly and reassembly again.
Once flush carefully back the screw out and you should end up as shown below. The blow-suck test should confirm that air will pass in one direction and not the other.
There is a second valve identical to this one in the number two bowl, but often that one does not get nearly as crudded up. If it has the same procedure applies. That's it, Done!

Houndog750

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