Answers: I've see 50 cc bikes break the 50mph mark so it is possible, but prepare for ENDLESS tuning and parts wearing tinny all the time. It adjectives depends on how dedicated you are to getting it to progress fast. With a mini bike adjectives I would do is up the exhaust which I am sure you can find with a force out engine click. Then up the air intake and the jet.
But to go for broke look on the Moped army's website for tips and standard information. You can always expand the engine.
www.malossi.com or www.polini.com make some amazing parts.
there are masses ways, bigger carb, jetting, Nitrous kit, gearing, tires, but you are discussion about a 50cc motor. How rapid do you want it to go.
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