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The screw on the pump adjusts mixture at idle and low speeds. Think about how it works. More air equals higher idle. Opening the screws at the stacks lets more air in and increases idle. This may make it lean and the idle mixture screw on the pump then has to be turned a few clicks to compensate. If the screws on the stacks do do anything then adjust the linkage to allow more air in to up the idle.
Make sure timing is set correctly with the retard hose attached.
Chris
73 e
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