720450 Mikuni Hsr48 Carburetor

The Mikuni HSR48 Smoothbore Carburetor is a dedicated racing component designed for high-displacement Harley-Davidson engines. Featuring a large 48mm venturi, this unit builds upon the architecture of the HSR42 and HSR45 to provide maximum airflow for big-inch motors. It is intended for custom installations rather than stock replacement and includes a rubber adapter flange for mounting to S&S Super G manifolds. The carburetor is compatible with stock-style throttle cables used on 1990-2017 Big Twins. For engines exceeding 120 horsepower, Mikuni recommends integration with an electric fuel pump. This precision-engineered fuel delivery system ensures consistent performance and throttle response for extreme builds where standard carburetors reach their flow limits.