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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.
 | 42-7: 1990 to 1999 1340 Big Twin Evo with stock CV type manifold. Includes 42mm
carb, airbox adaptor and chrome cover. |
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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. |
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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 Sportser/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. |
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42-11: 1994 up Sportster and Buell models. Must use aftermarket performance air filter |
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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.
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