Lots of people "upgrade" their bikes and scooters using readily available kits. On bikes the motor is limited to 250w and speed to ~15mph.
Stick a 1000w motor on and it goes somewhat faster!
In theory if a bike goes faster it then becomes a moped in the eyes of the law and needs insurance, tax, mot, helmet and a licence (or L plates).
In practice I don't expect the police to be remotely bothered unless (a) someone is seriously injured, or (b) it's a very quiet night etc
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