Ok WR guru's. I have 9200 miles on my WR450. It has dual sport, singletrack and harescramble type riding. At about 8,000 miles my valves came out of spec for the first time! I know amazing ey! It has finally started to puff a bit of smoke and I am thinking it is time to do some motor maintenance. Of course money is always part of the equation but so is doing it right. I have not checked valve clearance and couldn't tell you it they are within spec at this time or not. That will be done very soon. I was thinking about just slapping a ProX piston kit in it and running it for another couple grand but really want some input. If this was yours what would you do and why?