Well the JR isn't really a performance machine, got one for my son as a starter bike to learn the gears, he just moved up from a JR50. This is an air cooled play bike, don't want it to run too hot and fast.
I would think the only real option to increased performance would be an aftermarket exhaust - may want to see if an RM80 muffler could fit, don't know about the expansion chamber - you could also open up the airbox, and play with the jetting.
If you are looking for a race bike, a KX65 may be a better bet, or even move up to the 80cc MX bikes.
This is an interesting question, I have not heard of any people modifying these bikes for added performance.
This thread should be in the mini forum, some good questions.
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