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The regulator/rectifier is usually at the front of the scooter. You should see it after removing the panel with the headlights.
There are all kinds of kits to enhance speed of scooter even nitrous oxide look on e-bay
It controls , example the regulator controls the fans speed.
Top speed for an electric razor scooter is around 10mph.
They would both be about the same for speed.
When engine's rpm increase, the elctric generator of the scooter or motorcycle and any other vehicle will rotate also at high speed. It will produce more electricity the more you idle your engine. Some motorcycle's and scooter's voltage regulator is not accuratetely suppress the excess electricity coming from the electric generator (it is maybe due to price competition between vehicle manufacturers). Over-voltage will burn-out your lights and it shorten the life of your battery. So I suggest to modify your voltage regulator but only well known electronics technician or engineer know how to choose the suitable regulator and how to install it.
55-70mph is top speed of the scooter.
A 300cc scooter will generally top out at around 85-90 mph.
The 250 cc motor scooter is commonly the largest engine size scooter. The 250 cc scooter has a top speed of about 75 miles per hour, but usually the engine size will top the speed out at about 60 miles per hour.
40-60 kph.
The maximum speed limit for a 150 cc scooter is around 60 mph. The size and weight of the rider plays a large part in the top speed.
12 mph on a scooter is 12 miles an hour (about 4 times walking speed)