Check your country's laws. Right now for most of Canada the gasoline motored MB's are illegal. You can do whatever you want with electric but many have been busted riding their China motored bikes. I think there's a lot of difference between enforcement among the Provinces. It's mostly the Eastern ones where riders are having a problem, that and BC.
Make subtle inquires, it might be that Alberta places low emphisis on motorized bikes
There is a legal option where they can't say anything and that's a pusher bike. Run any sized motor you want, 6.5 HP Harbor Freight motor, and 1 drive wheel connected to the bike with a pole. These don't wear on the bike tire, small drive wheel with gokart tire, easily detachable. There are some threads on pushers here with good ideas.