I have duned my 07 since I bought it in Nov 06 and rode it on the average of twice, hard in the sand untill now. I stroked it with an 8 mil crank a year ago, dyno'd it 3 times (with about 150 pulls) and raced the hell out of it constantly and reving it up to the rev limiter a lot. This motor is holding together great so far, knock on wood. I do change my after every other ride and use amsoil synthetic so i'm sure that helps too.
Grant