Checked the valves on my 03 KLX400R today and they measured .005" for both intakes and the exhausts were .010" and .012" For the .012" valve, I couldn't get a .013" feeler gage to fit so I think the .012" is a good measurement. The bike has 3100 miles on it now. The last time I checked it was around 900 miles and for the intakes I wrote down .004" and .006" and for the exhaust I had .009" and .011", respectively. It appears to me that they loosened up slightly, however, I thought they would tighten up? The bike is used for dual sports, trail riding, and an occasional enduro (usually finish last). To me this bike is really a good dollar machine and it's a keeper. Keep riding.