HSR Kits

Mikuni HSR Smoothbore Carburettor Kits

The redesigned 42/45mm smoothbore carburettors from Mikuni install quickly using the original stock throttle cables. The HSR flatslide carb delivers excellent throttle response and improved rider control. The smoothbore allows the engine to reach its full power potential, so you accelerate and pass with confidence. You'll get good gas mileage and many years of dependable, carefree performance. These kits cover more models with fewer part numbers. Kits include instructions and hardware for each application.

NOTE: HSR Carbs use stock Harley-Davidson throttle cable. Each Mikuni Carburettor Kit is designed to be an easy bolt-on application complete with all necessary parts. The HSR42 or HSR45 carburettor in the kit comes pre-jetted and ready.

Types of Kits

Easy Kits for Sportsters, Big Twin and Twin Cam
models

Bolt On a 25% Power and Torque Increase!

Mikuni's Easy Kit dramatically improves the performance of Harley-Davidson's new Twin Cam engine and delivers unmatched throttle response and acceleration! Used with a Screamin' Eagle Air Filter and an aftermarket exhaust system like the optional Screamin' Eagle Mufflers, the HSR42 Easy Kit adds 25% more horsepower to the output of Harley's new motor. Maximum horsepower is increased from 57.8 to 72.2 hp, and Max torque from 71.4 to 80.7 ft/lbs.
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.

Click to go download the Easy Kit Installation Instructions.

Easy Fit Kits for Big Twins

42-18: 1999 to present Twin Cam models. Includes 42mm carb, air box adaptor and instructions. Use the stock oval chrome cover.
1990 to 1999 1340 Big Twin Evo when replacement chrome air cleaner cover not required.

$374.00

45-5: Easykit 1999 to present Twin Cam, 1990 to 1999 Big Twin Evo. Includes 45mm carb, air box adapter, instructions. Must use a H-D Screamin' Eagle Manifold Kit: Nos 29634-00(HTTC), 29635-99 (TC) or 29636-99 (Evo)....

OR for superior mounting and increased performance, use Mikuni's manifold as below.

$385.00

HS42/061-45TC

$93.50

Twin Cam Manifold

HS42/061-45

$93.50

Evolution Manifold

HS42/062-45

$44.00

Rubber Mounting Flange

Sportster/Buell Kits

Mikuni offers two different HSR42 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 high flow replacement filter. The other kit, without the backing plate, works on Buells and Sportsters with an aftermarket performance air filter assembly.

Click to download the Sportster/Buell Installation Instructions.

42-10: 1994 to 2000 Sportster 1200. Includes 42mm carb, with special air box back plate. Requires the use of the stock oval cover and a high flow replacement filter.

42-11: 1994 up Sportster and Buell models. Must use aftermarket performance air filter

N/A

$385.00

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 carburettor, new performance manifold, rubber flange, high flow K&N Filter, chrome cover, 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.

Click to download the Total Kit Insallation Manual.

HSR 42 Total Kits

42-8: 1984 to 1999 1340 Big Twin Evo. Includes breather kit #KHS-020 for 1993 and later models. Note: 1984 to 1989 models require cables from 1990 to 1995.

$572.00

42-19: 1999 to present Twin Cam 88/95. Includes new breather kit # KHS-030 for Twin Cams. Note: Use your stock throttle cables.

$605.00

HSR45 Total Kits:

45-2: 1984 to 1999 1340 Big Twin Evo. Includes 45mm big bore carb, Kit #KHS-020 breather and a 45mm flange.

$737.00

45-3: 1984 to 1999 1340 Big Twin Evo. Same as kit above without intake manifold.

$627.00

45-4: 1999 to present Twin Cam 95. Includes 45mm big bore carb, breather kit #KHS-030, new manifold with MAPS location and 45mm flange.

$660.00

Race Kit 48mm for Big Motors

Designed for the serious race engine builder and extreme motor enthusiast looking for more power. Recommended for 120ci engines or bigger with high flow heads and cams Kits include a 48mm smoothbore carb, rubber mounting flange (78mm bolt hole centres), choke cable, four main jets. Builder supplies manifold and appropriate air filter or velocity stack Uses stock Harley CV type cables.

48-2: HSR Race Kit, Standard.
Standard cast alloy body, cadium fittings
48-2P: HSR Race Kit, Polished.
Hand polished cast alloy body, chrome fittings.

$440.00