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To make your adjustment you will need to loosen the lock nut on the needle and seat. This will allow you to turn the adjusting nut to raise or lower the float level. Each hex flat on the nut will change the float level approximately 1/32-inch. When you have the fuel level just below the sight plug hole you will then tighten the lock screw and reinstall the sight plug. Make sure you have a shop towel handy in case you have any fuel leaks from the sight plug or needle and seat adjusting nut.