Carburetor Technology Clearance
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With a good diaphragm in place the first adjustment to check is the clearance between the pump operating lever and the pump diaphragm cover's arm, at wide open throttle. This clearance should be around 0.015-inch. The purpose for this clearance is to assure that the pump diaphragm is not stretched past its maximum limit at wide open throttle, which would cause premature pump failure. View Related Article
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