top end rebuild

With racing season underway with one race already down I was wondering when I should rebuild the top end on my 06 yz450f it now has 15.6 hours on it now.:applause:

With racing season underway with one race already down I was wondering when I should rebuild the top end on my 06 yz450f it now has 15.6 hours on it now.:applause:

I'm not sure about the 450, but the book calls for a fresh piston every 50hrs on my 426 if you race it. I don't race but ride the woods hard and went 300hrs on the original piston and valves before doing a top-end....and everything inside was still in spec! Don't forget you are on a Yamaha.

With racing season underway with one race already down I was wondering when I should rebuild the top end on my 06 yz450f it now has 15.6 hours on it now.:applause:

It depends on how hard you run it. With only 15 hours, its probably just starting to break in. Check your valves, put a new spark plug in and ride. :lol:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now