around 40 horsepower driving the 4 inch rear tire and it was geared down so i could actually ride it in the trails not it ride me. it honked doing round 110kmh if i goosed it in 5th it would lift the front tire straight up. im gonna miss it this summer :-/ maybe ill save up an dget another one only newer. and that one was prolly 20 feet behiond the bike on the corner of my race track after the whoops. it was sweet under you