Checked my valve clearances again today, on both the WR250F and WR450F. Both bikes are at about 3,500kms (2,200 miles). Guess what, they still haven't really moved since break in! Man I love these blue bikes! Everything looks brand new up top too, plenty of oil up there as well! For any of you who haven't checked them yet, It only took me about an hour to do both bikes, and I was taking it easy. It is very simple to do.