just so you guys know, you can buy the same engine kits that come from any supplier, they have the same quality and they run great from zoombicycles.com they are cheaper (80cc engine kit-$150 and 49cc engine kit-$130) i am not kidding. if you live in canada they have free shipping, they also offer performance parts like shifter kits, expansion chambers, high flow carbs etc.
Daniel Spence
P.S. I live in Morden, Manitob, Canada