I’ve been a motorcyclist for most of my adult life. I bought my first bike, a 98cc Excelsior Consort when I was 16.
It should have looked a bit like this, although in reality it was rather scruffy. But it was a bike, and it had an engine.
My two most recent bikes have both been BMW C650GT maxi-scooters.
There is some information about parts for the C650 on this page