[svandamme]

we used to overcook 40 cc mopeds...

standard they would do like 40km/h ( the legal limit for that class )
but it wouldn't take much mucking about to make em go 80km/h
just removing the exhaust restrictions


to get past that , wouldn't work easely (talking no gearbox mopeds here)
and that required boring out...

the really hot thingies were the Zundaps, 40CC stock
and gearboxes... those things were legally scooters, but there were 60 or 80 or more CC kit's out, that made em effectively motorcycles , not scooters


as for forced induction > what Bob says... don't make much sense in a 2 stroke... 2 stroke is about simplicity , they are not efficient with the fuel, and have poor emissions..
if you need more power, you oughto look into a 4 stroke motor