its has 15 hp water cooled its a polini motor the bike is called a grc its stupid fast i gps it a 85mph i weigh 130pounds but i cant keep it on the ground damn thing hits its power band an front wheel come of the gorun has new cylinder an piston new tires very sweet bike i payed 3k i have proof of that price im sellin for $1,600 obo or may trade for sumtin just lmk heres sum pics of it like i said its stupid fast!!!!!!!!