When I bought my 99 400, it was 3 months used. It's my only bike at the moment and I ride it a lot, year round. Mainly it's bars, tires, chain, sprocket, grips and normal wear stuff. However I have replaced my fork seal and bushings, I'm on my 3rd fuel tank, 2nd throttle cable, and rebuilt my muffler several times. The weirdest was the slide in the carb developed a huge crack in it. This is the small aluminum piece on the front of the slide (nearest the cylinder). Once I replaced it ($75!!), it quit backfiring and ran like new, along with the new topend of course. Every year I keep thinking about a new bike, but why? I just race local MX for fun and trophies, and the it's not the bike's fault if I don't go fast.