BRAND NEW PART # 42-8 or 35-9321 Mikuni HSR42 Complete Kit 1984 to 1999 1340 Big Twin Evo. Includes breather kit #KHS-020 for 1993 and later models. We recommend the use of a higher flowing Mikuni carb as the first step in any performance upgrade and to take advantage of the full performance potential of your evolution motor. Add a HSR42mm kit on a stock bike along with a good Exhaust System and you’ll notice a huge performance increase. Total Kits for Big Twin Evos Shown above. These kits are complete with everything needed for a total installation. Kits include an HSR 42mm carburetor, new performance manifold, rubber flange, high flow K&N Filter, chrome cover, breather kit and mounting hardware. Stock throttle cables from 1990 and later models can be used. Note: 1984 to 1989 Evo models will need new cables from a similar 1990 to 1995 model.