I am looking into buying a 04 450. I am pretty new to the 450's and dont know all that much about them. The guy said that he is the second owner-first owner raced it in the 40+ class (does that mean age?) and that he only put about 10 hours on it. Its got a yoshi pipe, rental bars, and a couple other things. What are the most common problems with these bikes? What problems should I look for? About how much would you guys say its worth?