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While the main body is still inverted, the idle mixture screws can be easily removed. If your carburetor ran fine and you're just rebuilding it due to leaks, take a note of which screw you are removing and begin by carefully turning the mixture screw in (clockwise) until the screw seats, counting the turns, then remove it. Repeat for the other mixture screw. Be sure to write the number of turns down so you can return them to the same settings.