I checked my valves yesterday for the first time. I got my bike last June and put 320 miles on it before the weather went bad, and my wife had our third duaghter. Over the winter I cleaned everything, installed fatbars, new twin air and oil filters, changed the oil(not the first time), greased the axles, tore apart and greased the swing arm, installed a trail tech computer, and installed new renthal dual layer grips. Yesterday I finally got up the courage to tear into the motor and check the valves. I almost bought another XR when I read last year that this had to be done regularly. It was no big deal. It took me awhile to figure out where TDC was, the pictures in the manual did not explain it well. My clearances were dead on. Now I can forget about it till next winter. It was so easy now I am thinking about that YZ cam.