I have ran mine once. It ran good but I was plagued with clutch problems and my motor mount wasn't stable enough. I would consider my build a fairly mild one. Isky 246 .330 cam, Raceseng S2 flywheel, billet rod, ported head, champion rockers, stainless valves, Mikuni 34 flat slide on alcohol. I had mine mounted to a wing outlaw kart. I would say it makes around 30 hp and it has a lot of torque.