Mikuni American Corporation

Easy Kits:

Simple installation and easy adjustments make the Mikuni "Easy Kit" one of the best and most popular ways to improve the performance of a Harley-Davidson motor. Easy Kits use the stock intake manifold and stock throttle cables making installation very simple.

The HSR's unmatched throttle response and excellent air/fuel mixture control gives it a clear advantage over its competition. The design evolution of the Mikuni HSR carburetors goes back more than 80 years and stands at the end of a long line of excellent motorcycle carburetor designs.

Easy Kits for the Twin Cam and Evolution models add both power and all around performance to stock or moderately modified engines. With a free-flowing air cleaner and mufflers a Twin Cam motor picks up a solid 15 Horsepower. A similar Evo gains 12 or more.

Total Kits:

These kits are complete with everything needed for a total installation. Kits include an HSR 42mm or 45mm carburetor, new performance manifold, rubber flange, high flow K&N filter, chrome cover, chrome breather kit and mounting hardware. Stock throttle cables from 1990 and later Big Twins can be used. Note: 1984 to 1989 models will need new cables from a 1990 to 1995 model.

Sportster/Buell:

The HSR42 carb in the Sportster and Buell kits requires slightly different jetting and a different throttle cable bracket than the Big Twins. Mikuni's two Sportster/Buell kits differ in that one includes a high performance air cleaner backplate and the other does not. This Mikuni backplate is a robust design that works with a K&N stock replacement air filter or the larger Buell racing filter. Buell owners should buy the 42-11 kit and must use an after market air cleaner assembly.

Use stock Harley cables (1988 or later).

Easy Kits for Twin Cam, Evo and Sportster models

These kits are designed to work with your original Harley-Davidson intake manifold, choke cable, air cleaner and throttle cables. You can run other high performance air filters designed for the CV type carb by using the special adapter included in the kit.

42-7	1990 to 1999 1340 Big Twin Evo with stock CV type manifold.
	Includes 42mm carb, airbox adapter, chrome cover, installation instructions and tuning manual.
42-18	1999 to present Twin Cam models; 1990 to 1999 Big Twin Evo.
	Includes 42mm carb, air box adapter and instructions. Twin Cam uses the stock oval chrome cover. Evo uses the Screamin' Eagle air cleaner or most aftermarket air cleaner assemblies.
42-10	1994 to 2000 Sportster 1200.
	Includes 42mm carb, with special air cleaner backplate. Can use the stock oval cover and stock filter element.
42-11	1994 to 2000 Sportster 1200, Buell models.
	Buell models. Must use aftermarket performance air filter. Sportster tanks must have fuel petcock on left side of tank.

Total Kits for Big Twin Evolutions and Twin Cam models

These kits are complete with everything needed for a total installation. Kits include an HSR 42mm or 45mm carburetor, new performance manifold, rubber flange, high flow K&N filter, round chrome cover, chrome breather kit and mounting hardware. Stock throttle cables from 1990 and later Big Twins can be used. NOTE: 1984 to 1989 models will need new cables from a 1990 to 1995 model.

HSR42 Kits:

42-8	1984 to 1999 1340 Big Twin Evo.
	Includes chrome breather kit #KHS-020 for 1993 and later models. Note: 1984 to 1989 models require cables from 1990 to 1995.
42-19	1999 to present Twin Cam 88/95.
	Includes new chrome breather kit #KHS-030 for Twin Cams. Note: Use your stock throttle cables.

HSR45 Kits:

45-2	1984 to 1999 1340 Big Twin Evo.
	Includes 45mm big bore carb, chrome breather kit #KHS-020 and a 45mm rubber flange.
45-3	1984 to 1999 1340 Big Twin Evo
	Same as kit above without intake manifold.
45-4	1999 to present Twin Cam 95.
	Includes 45mm big bore carb, chrome breather kit #KHS-030, new manifold with MAPS location and 45mm rubber flange.