Just got an 06 rmz 250. Have not ridden it yet. Understand its the same motor as the kx 4stroke. The changes were suppose to correct all problems. My buddy has had his for a few weeks. Has minor clutch problem. Was told to put a Hinson clutch with heavier springs. Also still having cooling problem. Changed rad cap to a 1.6 and 2tocool. Is better but is contemplating on Boyesen cap & pellar.