I have an 01 WR426 and have been having some carb issues. Nothing big that i can't get dialed in except the mid body seal that I stretched out before I found out you should never take it out (nobody even makes or sells a replacement for it). I Have a lead on a used car off a 99 YZ400F but I am not sure if it is the same carb. Assuming it is not, is it interchangeable? If it is compatible, is it a big hassle and what kind of problems would I be looking at if I were to put it in my bike, and would it affect the performance negatively? Thanks for any help or input.