Mikuni offers 2 different HSR42 Performance Carburetor Kits for Sportsters and Buells. One Kit, just for Sportsters includes a special airbox backing plate as shown to work with the stock oval cover and a Screamin’ Eagle high flow replacement filter.
The other Kit, without the backing plate, works on both Buells and Sportsters with an aftermarket performance air filter assembly. The Mikuni Kits work with the stock push-pull throttle cable assembly.
Mikuni claims that the popular Mikuni HSR42 Performance Carburetor Kits Sportsers, Buells and stock Big Twins are offering a 25% increase in power and torque when used with an aftermarket exhaust system. All Mikuni HSR smoothbore carburetors offer a high air flow while providing highly accurate fuel metering, more power, and Mikuni’s renowned precision throttle response. Carburetors are designed with an 8-roller bearing flat throttle slide assembly for smooth throttle control with reduced effort, that allows an unobstructed venturi at full throttle to flow more air, while it mixes fuel more precisely at all throttle settings. The Mikuni adjustable accelerator pump provides instant throttle response in any riding or performance application while a high capacity float bowl prevents fuel starvation even under full throttle applications.
Mikuni HSR Carburetors and their Performance Features, Tuning Components, Replacement Parts and Rebuild Kits are available from Mikuni Dealers and Distributors in the USA and Worldwide.