Just replaced the CB key. I did a search on this site and got some great info on how to change. Not to bad of a job. If I only have to do this once a year, not bad. One thing I would suggest is if you do not have a clutch tool, get one before the change.. Just read in MX action mag. that for 03' the YZ was going to be a 450? anyone have any better info on this. If this is so and they shed some wieght, I may have to take the plunge and get one.. Thanks to all those who posted help for the CB key change.