Adjusting the Accelerator Pump

The pumps job is to shoot some fuel into the carb when the throttle is first opened. This is necessary because the normal circuits can’t add fuel fast enough during acceleration. It only functions through part of the throttle range, starting at idle. It does not go out of adjustment on its own and rarely needs replacement,except possibly after a carb rebuild. Symptoms of a non-functional or mis-adjusted accelerator pump are a bog or stall when you accelerate from idle in a normal or brisk manner.

This is the adjustment nut.

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