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Old 12-17-2010, 10:44 AM   #5 (permalink)
Ryland
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honda cb125 - '74 Honda CB 125 S1
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It really depends on the moped and the speed you want, most states and countries limit mopeds to either 25mph or 30mph so bumping the top speed up to 35mph is about as far as you can go without getting ticketed.
Most states and countries also limit a moped to being 50cc with an automatic transmision.
Tomos mopeds tend to be popular for going faster because they have a two speed automatic gear box instead of a belt drive, they also have a very durable engine that can handle the extra stress, you can get sprockets to swap out as well to give you higher gear ratios.
Most mopeds are tuned very closely to reach their top speed then stop, newer mopeds have CDI ignition that limits the RPM of the engine, the intake and exhaust are both tunned in size and length so they run at a given speed but self limit at higher speeds.

So yes, it's possible to make a 50cc moped travel faster, but there are no blanket statement tips that will work for every moped.
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