Only first gear
Imagine only the first gear of Your car works. How terrible loud it would be, how extreme would the gasoline consumption increase.
Exactly in this way are gasoline scooters brought down to 25km/h. Terrible loud,
enormous gasoline consumption. Here becomes at a service station a scooter changed from 45km/h to 25km/h. The working area of the variomatic is changed, that the highest engines RPM is necessary for 25km/h.
Other methods are to stop ignition, the gasoline goes unburned through the exhaust. How can a law maker allow thie unbelievable primitivity? There is the electric bulb forbidden, but something like this is still allowed to sell?
Most 45km/h electric scooters are also available with 25km/h. L3E (125ccm up to 11 kW) scooters like the Solar Scooter Sport tested by me are also offered with 45km/h registration. Only the engine controller is reprogrammed. The 25km/h version is most time listed with 50% more range, because the consumption is less.