i`ve got an YZ450F 2008 during engine rebuild. I assume that the motorcycle may have 250-300 moto-hours already, but can`t tell it precisely (when I bought it I`ve mounted the motohour counter and done 100 mth myself).
The question is:
how can I check if the TITANIUM intake & exhaust valves need replacement?
I took them out - they look fine, no scratches, the contact surface of the valve and seats looks ok. the engine has compression and doesn`t burn oil.
I`m only affraid that the valves may one day brake apart and make a huge mess in my rebuilt engine. But the titanium valves are quite expensive, you know the pain...
I don`t have any pics of the valves and head at the moment, but here`s a pic of the engine with new bearings and PROX crank
Edited by thefex, October 01, 2014 - 01:36 AM.