Ran across a thread on a Rubbermaid scooter site that mentioned "rollers"? A device cops in some European districts use to check the top speed of a bike if they think it's been modified past the moped designation. Anyone ever encountered this?
Seems iffy to me. Does it give resistance or just measure unloaded speed? My moped is legal with me on it, I can only get 27 mph, but my son is light enough he can push it up over the legal 30 mph line. I'm sure unloaded it'll spin up closer to 40. What about the poor 400# dude who has modified the hell out of his DUIcycle to get it to go 30 mph while carrying his fat ass?
I'd run two CDI's if I were in a jurisdiction doing this. One with a limiter, one without. Have some sort of hidden switch to change between them.