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I set mine so the adjustment bolt just touches the pump arm, with no pressure on the diaphragm.
 

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Hold the throttle wide open,push the acc pump arm down with a screwdriver , adjust the screw to about 13-15 thousandths.
 

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^^^^^^ X2.... 425ci has it right. We even recheck for a little clearance every time we have the bowls off, otherwise you won't get full stroke on the accelerator pump.
 
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