After thousands of miles and hundreds of dyno hours, the result… JIMS 120” and 131" Race Engines. ![]() JIMS did their homework, built the parts, tested, refined them and tested some more. ![]() There is enough case material to support a bore size of 4.800", substantially thicker than a stock Twin Cam. JIMS has concentrated development on building a solid foundation for further modifications. It is strong enough to produce much, much more. As it stands, unmodified, the JIMS 120” and 131" Race Engines deliver 135 ft/lbs torque and 130 Horsepower. JIMS is widely considered the premier manufacturer of aftermarket performance racing engines and transmissions for the Harley-Davidson and custom motorcycle industry.Įvery design element and every part of JIMS 120” and 131" Race Engines have been developed and optimized to produce a balanced, durable and very powerful racing engine. ![]() JIMS USA was established in 1967 in Camarillo, California.
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