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You cant go that big with a 50cc bottom half. Restrictors on a 50cc are in the stock pipe, block, manafoild, bottom half ports, crank, air box. you can visit metrakit.es and the polini website for parts. for two strokes you will only gain modest increases in performance with easy changes (ie running a stack instead of an airbox, and from which you would have to use a larger main jet in youre carb, while you change the pipe. Remeber whatever you modify before the cylinder to make the engine breather free-er, you have to make sure you buy a racing pipe, or less restricted pipe to maximize youre gains.)
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