Classic scooter design

[CWheelOK]

Scooter engine is either attached to the rear axle or under the seat with a continuously variable transmission transferring power to the rear wheel.
Most scooters have smaller engines than motorcycles (between 30 cc and 250 cc with a single cylinder, though some models have twin cylinder motors).
High-end scooter models now include comprehensive technological features including cast aluminum frames, engines with integral counter-balancing, and cross-linked brake systems.
By the way, cheap electric scooter is very popular
In many localities, certain road motor scooters are considered by law to be in the same class as mopeds or small motorcycles and therefore they have fewer restrictions than that of larger motorcycles.

[Archangel]

Er...fascinating !

[Porkscratchin]

RUG springs to mind....