I've had my 02 WR426 for two years now and am still over the moon with it. The only hiccup i've had, and its a minor one, is a very clattery chain/chain guide sound, which other riders have commented on and an O-ring chain which doesn't appear to hold lube. Its been there every since I bought it (second hand). I clean it regularly, lube it after each ride/wash, and keep it properly adjusted, but no matter what I do it seems to run dry after five minutes of riding and makes a hell of a racket. I've checked some of the usual signs of wear indicated in the manual (measuring a set number of links and seeing if its within spec etc). The sprockets are in perfect condition and I cant find anything loose anywhere. Anyone had the same problem?