I was thinking about putting together one of those nifty kx125/kdx2?0 hybrid bikes but was looking for a bit of advice first. I want to create a great back up trail and woods bike. My back up bike right now is a yz250, and aside from it being kind of a lemon, it is just too much whenever it actually does feel like running nicely for me. I love the feeling of 125's and always have, but having a smoother motor with a bit more bottom end would make the bike a lot less tiring to ride. I have read a few of the kx125/kdx220 conversion threads, and there seems to be a few compatibility issues among certain years. What year kx125 is most compatible with what year kdx200/220? Also, should I be looking for a kdx200 or 220 donor bike? What differences are there in the motors? I would like to do this in as cheaply as possible. The other thing that I have to consider is green/red sticker status here in CA. Would an 00-02 kx125 handle a lot worse than a newer one? Any advice would be greatly appreciated. Thanks guys.