I should have stuck an hour meter on my 2012 WR450, but I didn't until recently. That being said, I'm guessing I have 300-400 hours on it. How often are you guys replacing rings and/or piston? I was using the mileage as a rough go-by, and checking the valve clearances every 1,000 miles and none were very far off. I think I had I only had to adjust the same one 2x. Recently my speedo started showing the wrong speed (like double what I was doing), so that method wasn't too good.