Jetting mixture screw Keihin Butterly

The air/fuel mixture screw is normally plugged off at the factory to prevent for tampering. You won't even find it in a Harley parts catalog. This one fits the Keihin Butterfly carburetor on all 1976 thru 1984 Shovelhead, 1984 thru 1989 Evolution Big Twin, and 1976 thru 1987 Sportster.