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Carburetor Information
U.S. CB750 Models 1969-1978
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Repairing 77-78 carb accelerator pump valves - Pg 6

I used 600 grit wet-or-dry sandpaper here because I was out of 1000. 600 is acceptable but finer is better.

Hold the ball down with one or two fingers and slowly roll it around in circles on the sandpapaer (below). Change the radius of the circles a little as you go to be sure and cover the entire surface of the ball.

As you do this you'll see the rust and gunk come off on the sandpaper. Not a whole lot of work is needed so check your progress regularly.

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