Everything on these bikes like to go pretty fast, but I have heard of more electrical problems than any other thing. Mainly the battery and charging systems.
As far as performance there is not much you can do. I guess high modification isn't a problem, but I don't know if the little motor could take it. Custom from a machine shop is going to be your best bet.
You could mabye find a piston, cam, or rods at a dealer ship, but they usualy don't do "parts in a bin" any more so you'd have to know a motor thats simmilar.
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