i met a guy at durhamtown plantation a couple years ago, and his YFZ was setup for drag racing, all i remember about the motor is that it was stroked, he let me take it down the dirt strip they had there and it would just GO in any gear i put it in. Amazing tourque...Lauched in 4th. good arm puller. A few weeks later i saw him again in my town in Eatonton GA, at the 1/8th mile strip, and he beat a guy with a ds650 with nitrous.