I am on the market for a used YZ 400 or 426. I have not been on a bike in about 5 years...last bike was a KX500. I want to give some mx racing a try and feel the 500's are just too much for the mx tracks of today being so supercross influenced. So I figured the YZ 400 or 426 would be a good choice becuase the 4 stroke power is so forgiving. My question to anyone who has knowlege of these 2 is: What is the difference besides the cc's. Recomendations and suggestions are much appretiated. :think