I would like to jailbreak a 50cc scooter. Get rid of limiter and add nitrous. That would be fun to crash on them tiny tires.
I not saying I did this, or that there is one sitting in my garage, but if a 150cc scooter has decals that say 150 you might be able to peel off the '1' and turn it into a "50" pretty easily and cheaply. Like I said, not admitting to anything, and I might have lost it in a boating accident . . .