OK guys, just got back from travel and I did the YZ timing mod. It went smooth thanks to all the help I got from this forum. I rode the bike around the coldesack (sp) and it runs like a raped ape, but, at full throttle, high rpm, it misses. It seems the jetting is off now. I am not sure what to do. Should I go to a 165 main, or should I just move the clip from 3 to 4 position? Thanks in advance for any advice.