Mikuni Carburetor – HSR42 42mm (Polished Finish) #TM42-6PK. Genuine Mikuni, Made in Japan. 1990 to 1998 1340 Big Twin Evolution models sold in California. Includes 42mm C.A.R.B. carb, airbox adapter, A/C cover and instructions. C.A.R.B. exemption No. D-389-4.

Mikuni HSR Carburetors are designed for performance engine builders who need a standalone carburetor for custom and race applications. These carburetors are available in both Standard aluminum and Polished finishes to suit various aesthetic and functional preferences. This carburetor utilizes the stock choke cable from a CV-type carburetor. Choke cables are available separately.

Smoothbore Carburetors

The Mikuni HSR Carburetor Series is engineered for serious riders seeking peak performance from idle to wide-open throttle on their American-made V-Twin engines—all without sacrificing reliability. Offered in 42, 45, and 48mm throttle bore sizes, HSR Series carburetors deliver better throttle response, more torque, and more horsepower. Available individually, as bolt-on kits that retain your bike’s classic look, or as complete kits for serious performance enhancement. Built to provide smooth, steady acceleration and a significant horsepower boost, the HSR series gives you everything needed to fine-tune your ride and elevate your experience on the open road.

Bolt On a 25% Power and Torque Increase!

Mikuni’s Easy Kit dramatically improves the
performance of Harley-Davidson’s 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
Twin Cam motor. Maximum horsepower is increased
from 57.8 to 72.2 hp, and maximum torque from
71.4 to 80.7 ft/lbs.

Special Order. This item is drop ship-able from Mikuni American. Please contact us for current availability status.

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