Germany:
(Liablility insurance can be calculated only, i.e. with huk24.de.)
"Kleinkraftrad" (moped, no tax/registration/inspection).
50cc scooter constant 50-75 € / year depending on drivers age (older = cheaper).
"Leichtkraftrad" (125cc 11kW small motorcycle, no tax, registration for 50 € is valid until owner or district change, inspection for 50 € is valid 2 years)
scooter >80km/h between 20 and 80 € depending on the driver (proven accident free, experience).
scooter <=80kph 3-4x more expensive, because 16year old may drive them.
motorcycles 1.5-2x more expensive than scooters.
"Kraftrad" (motorcycle, 1.84 € tax for every 25cc displacement, i.e. 37 € for 500cc; registration/inspection same as Leichtkraftrad)
In addition to Leichtkraftrad the insurance depends on engine power. Disproportional rising premium if >= 100 hp.
500cc scoot 40-120 €.