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Is it a 50cc motor? A lot of scooters are limited by spacers placed in the variator, which limits the range of the CVT and thus the ratios available in the transmission. On my scooter (50cc 2 stroke), there were also restrictors placed in the intake and exhaust that cut down on the amount of air that could flow into and out of the engine. By using a dremel to remove the restrictors, I picked up another 10 mph from the scooter, going from a top speed of 32 to 42 mph.
If you remove restrictors from the engine, though, most times you will have to rejet the carb to keep the engine from running too lean or rich.
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