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.
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4 stroke engine packages
Class leading stock and modified engines that meet current rules.
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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
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Supermini engine packages

JMS PERFORMANCE

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Custom cylinder heads
and machining
Big bore cylinder and stroker kits