Mikuni Hsr42 Total Carburetor Kit For Harley Big Twin Evo There are carburetor kits, and then there's the Mikuni Hsr42 Total Carburetor Kit. When you're ready to take your motorcycle's performance to the next level, it's time for a carburetor kit that improves starting, rideability, power, and torque. Get all that and more in this kit, featuring a two-piece throttle slide that rolls on stainless roller bearings, a lighter throttle return spring, a low-speed air screw, and an enlarged needle valve and float bowl. The Mikuni Hsr42 Total Carburetor Kit includes Hsr42 carburetor, performance intake manifold, free-flowing K&N air filter assembly, chrome air-cleaner cover, adaptors and detailed installation and tuning manual. Not compatible with cruise control. Fits all carbureted Evo Big Twin Models. Features Improves starting Improves Power Improves torque Two-piece throttle slide Lighter throttle-return spring Low-speed air screw Enlarged needle valve Fits all carbureted Evo Big Twin models Not compatible with cruise control