i got a pocketbike with that same pitbike engine in it which go pritty fast stock but mine has a hi compression piston, race head, cam, valves, hd clutch kit, Nx nitrous kit, 24mm mikuni flatslide, k&n filter, exhasut, red neons, unlimited rpm cdi, some upgraded sprockets and chain and some brighter lights and it flat out rips....ihavnt topped it out yet but it should hit somewhere around 80 or 90 if i spray the nos but im not real sure i wanna go that fast on it lol

 

koo, yeah it has the upgraded shocks and race head, cams and everything too. it doesnt have NOS though, that must be badass! 90 is pretty fast, dads can only go about 65-70... which isnt slow either, lol