Bought a 2001 WR426 a week ago. Been in a barn for awhile, but I did hear it run. Didn't ride it, just started it and shut it off. Was a good price, and I couldn't pass it up! Got it home and went through the usual things....empty the fuel, full carb cleaning, oil....etc. Bike is in pretty good shape....head, swingarm bearings are good, fork seals good....not too bad! Oil and coolant come out good and clean. However, I decided to check the valves. Supposedly, this is a "low hour" bike. The exhaust valves were in spec, however all 3 of the intakes were very, very tight! I could not get my smallest gauge (.038mm) to fit. I thought maybe I wasn't at TDC, but I tried 3 times and made sure...I just could not fit any of the feelers in there! Couple of questions: 1. What could cause such wear on the intake valves? Not cleaning the air filter? Why are the intakes so tight, but the exhaust valves seem to be fine? 2. Where do I go on the shim sizing since I can't get a gauge in there? Just take the existing shim size and subtract what it's supposed to be (.10 to .15)? So if it's a 1.9mm, I'd need to get a 1.8 or 1.75mm shim? 3. Should I also replace the cam chain at this point? It looks pretty good...tension is good, chain looks ok...... Thx!