I'm tearing into my 06 WR450 this weekend. Have you used Race Day Performance? They are about 15 min east of me. I have stock suspension with a yamalink and correct rear spring but thinking correct valving and fork springs would be nice. also curious what are the jets in your carb?
RDP has not responded to my email and I have not made a lot of effort to call them. I decided to buy race tech gold valves and install myself and just have someone add nitrogen when I am done.
I have new wheel bearings, swingarm bearings, pivot bearings and head tube bearings coming.
As for jetting, I don't remember what is in there now, but I do know that I am very happy with where it is at for 9000' and up.
Also, performance upgrades on power are not necessary for what I need. Bike has enough power to get me into trouble as it is. Maybe after some seat time with my fresh top end and new suspension i will change my mind. I have about everything I need for parts, now just need to get the powder coating done and I can start the installation process. I will say this, the white plastics with retro graphics are unbelievable.