As a motorcyclist and scooterist, I concur. I've got an un-faired motorcycle that can easily go faster than is physically comfortable. I've had ones with full fairings that were comfortable well past legal speeds (but the riding position meant lying down on the gas tank).
And on small scooters, small aerodynamic changes can have large effects on drag, and therefore top speed in atmosphere (discounting the availability of non-atmospheric operating environments, which are a little difficult to come by right now...) Example: 12-ish HP Vespa scooter that's just barely freeway legal, 59MPH top speed per the manufacturer. Add a low windscreen to divert airflow away from the rider's chest and arms, a satchel on the passenger seat and a tail-bag on a rack behind the seat to clean up the airflow behind the rider, and the top speed goes up to 65 with the rider ducking behind the windscreen.
Also, motorbike speedometers lie. All of them, by about 9% high, give or take.
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