JIMS performance parts for Harley Davidson motorcycles. JIMS is one of the industry leaders producing performance parts, accessories, tools, transmissions, and high-performance engines all aimed at enhancing the Harley rider’s experience. JIMS employs skilled craftsmen running an amazing collection of high-tech machines such as CNC machining centers, lathes and inspection equipment, with state of the art design and engineering capabilities, prototype department, and testing facilities to ensure quality is the number one priority.
Every design element and every part of JIMS 135" Race Engine has been developed and optimized to produce a balanced, durable and very powerful racing engine. As it stands, unmodified, the JIMS 135" Race Engine delivers 135 ft/lbs torque and 130 Horsepower. It is strong enough to produce much, much more. JIMS has concentrated development on building a solid foundation for further modifications. There is enough case material to support a bore size of 4.800", substantially thicker than a stock Twin Cam.
JIMS FAT 5™ Overdrive
You want strong transmission? JIMS® has strong! JIMS Fat 5 Overdrive is simply the strongest, toughest gearbox made. JIMS took advantage of its new, more compact shifter technology to increase the width and strength of every gear. The width increase varies from 18% to 53%, depending on the loads each gear set must carry. Big power is more popular than ever. Large engines like the JIMS 120 deliver double the stock power and torque. When such power is linked to the ground through high torque clutches and big sticky tires, the peak loads on transmission gears rise far above what stock transmission gears were designed to endure
JIMS Tools for Harley Davidson
Whether you’re just swapping cams or tackling a complete rebuild, JIMS tools will give you peace of mind Knowing your work is tested before the final assembly is through! In the past 40 years, JIMS has developed over 500 tools for use on Harley-Davidson motorcycles, all designed to let you build with confidence and precision. All JIMS manufactured tools are machined here in the USA and are guaranteed for life.
JIMS Transmission Rebuild Service
JIMS® Now offers a transmission rebuild service for Harley Davidson® and aftermarket transmissions. This includes your old
5-Speed all the way through the new Cruise Drive!
We all know times are tough. For some, that means keeping your "older" motorcycle running good instead of upgrading to a new bike. That's where this new Transmission Rebuild Service from JIMS comes in. You can now send your old, tired transmission into JIMS for a complete overhaul: JIMS will completely disassemble your transmission, inspect all wear surfaces and replace all bearings, and seals*. This is a great option for those who are trying to "maintain" their current bike instead of buying a new transmission or a new motorcycle. JIMS has built a reputation for manufacturing and assembling quality transmissions, including 5 and 6 speeds, Right Side Drives with bearing support and the JIMS Fat 5™ overdrive. This expertise is now available as an affordable option by industry professionals.