All you have to do is talk the EPA into it. They have big bore kits and pipes for ancient two cycle Vespa's, but they are all ready death traps stock. You'd have to up the suspension, brakes and health insurance.Scooter track racers are popular every where but America..
I some times question manufactures not wanting to build what people want instead of having engineers and marketing experts tell us what we want.
If some one built say a 350 two stroke scooter that paid attention to handling and brakes I would sure as hell buy it.