Mikuni American’s popular HSR42, HSR45 and HSR48mm Smoothbore Carburetor Kits are known world-wide as the best performing carburetors for American V-Twins. The popular Mikuni HSR42 Carb Kit is already an industry performance standard for Sportsers, Buells and stock Big Twins by offering a 25% increase in power and torque when used with an aftermarket exhaust Read More >