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Old 10-05-2008, 06:20 PM
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The large pumps help to cover a "hole" or "flat spot" that occurs when the throttle is opened.

In the case of the carb you have it was probably the previous owner's effort to get the engine running right with a carb that was way too big.

Normally if there is plenty of engine underneath the carb the 30cc pumps would probably be enough.
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