JMS performance is fast becoming the leader in four stroke racing technology.
With our state-of-the-art dynamometer with EFI mapping capabilities JMS is setting the standard for performance and reliability.
4 stroke engine packages
Class leading stock and modified engines that meet current rules.
National engine packages
JMS supermini engines are top of the class in performance and reliability.
JMS can build you an engine package that is capable winning a national championship. So whether you're writing a Yamaha, Kawasaki, Suzuki KTM, or Honda JMS power can get you to the front and keep you there
Supermini engine packages


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Custom cylinder heads
and machining
Big bore cylinder and stroker kits