S&S Idle Mixture Screw, O-Ring Style for Harley-Davidson

- With O-ring (late E/G style)
- Fits late style Super E and G carburetors only.
Note: Never overtighten the idle mixture screws on the E and G carburetors.
It is very easy to damage the angled idle mixture screw seat in the soft aluminum carburetor housing.
This is very difficult or impossible to repair.
May cause rough idling.
Note: The older style (approx. pre-2013) mixture screw (MCS 977815) is not interchangeable with the newer style (approx. 2013 and up) mixture screw (MCS 940521) with O-ring.
The late style carburetor body housing can be identified by the "Made In USA" text next to the "SHORTY" text.

Units 5