Ok well coming off a RM250, I have the whole valve thing to worry about. I need some info like what feeler gauges to use and where I can buy them. I also need info like the whole process of knowing what shim sizes are needed to be ordered and also I need to know how you can tell when its time to check or adjust the valves. Thanks. PS, Im sure I'll be having some more questions so dont be surprised to see me again. Also the bike I own is an 05 YZ450.