oh and my first post was intended at the actuall question about turbo'ing an aerox. not a good idea to force induction on strokers. four stroke scooters are no problem obv. i'm sure you could knock a turbo system up for vx or suchlike with the help of a local scrapyard, some one good at welding ally for plenum, and a tube supplyer...
ball bearing turbo's come to mind? you know, all this turbo talk makes me want to rig something up on my friends 4 stroke sukida. has a nice GY6 engine. would need something small though.
its doable but its small and needs to be accurate and youd need to get a wastegate manufactured, which isnt cheap, along with a fueling system, which isnt easy it CAN be done, but its big bucks and the gains wont be massive