I found a good deal on a new 03 YZ450, and have just sold my old 99 YZ400F. What's the speed difference between the two? The top end on my 400 was good, and i'm a little worried that the 450 won't have it on top because it's a 4 spd. I don't ride on the track at all, mainly in the mountains and woods with lots of fireroads. I know I should get a WR450, but they are $2000 more than this one. I have searched the forums and have not found anything as far as top speeds. I know I can always gear it taller, but like I said, I do a lot of woods riding, and don't want to fry the clutch due to slipping it all the time. Any ideas?