I have an 03 yamaha 450 and whenever I ride it while its hot the clutch is really wierd and unlike anything Ive ever felt. It engages really bad. Its either engaged or not engaged and whenever it does it makes a wierd urrrrrt sound. Im kind of wondering if the clutch is even getting oil. Doesnt smell wierd since it probably would if it didnt get oil. I took it apart awhile ago and everything looked good to me and my brother so I put it back together and did a short test ride and it was fine. I rode it a long ride again and it started doing it again. So I guess I am going to buy new plates for it and see what it does. And new springs. I want all of the plates. The friction plate ones and the steel ones. That is my only option I guess. What I need to know then does the 2003 and 2004 yzf's have the same clutch. The guy that owned it sayed the guy that owned it before him (his friend who is in Iraq I can't talk to) put an 04 clutch in it but Im not sure. Do I need to find out? Take it to a shop? By the way im asking you guys cause yamaha rider forum is no help. If I buy a new clutch hinson or gytr?