Hi, I just got back from the track and the 07 is awesome. The motor is a cross between the 04 and the 06. the 06 motor was like a Golden Retriever The 07 motor is more like a cross between a Jack Russell Tarrier and a Golden Retriever. In moto speak its more zingy (more free revving) more wheel spining but not alot. It's like they fixed the 10% that was wrong with the bike, Initially I was a little concerned with the performance but I disconnected the TPS and changed the fuel screw, the main jet and the pipe and was good to go. It turned better, I had the suspension done by http://www.enzoracing.com/ and also changed the tires. By the end of he day I was hanging with a 40+ Pro not bad for the first day on the bike.