OK, I know this probably has been covered a thousand times but I cn't really find help for my specific situation....Really it's a buddy of mine who needs help. He has a 02 wr250f that he has done most of the free mods to - grey wire cut, throttle stop cut, airbox cover removed. He has not done the BK mod but he wanted to try the YZ timing mod...So we did - And things went smoothly EXCEPT...now it doesn't want to run. It started at first after several kicks and ran rough then stalled...since then it just won't fire off..I am assuming it's a jetting problem (too Rich, right?)but what specifically needs adjusting? Just the pilot screw or does it need a new pilot jet? Or is it the clip that needs adjusting..Or maybe both?? Kind of confused on where to start...can someone help.....Oh he already has gone to a 175 MAIN (which shouldn't afect starting, right?)jet since he added a white Bros exhaust. We are in Virginia - around sea level. I'm really interested in this too because I have heard so much about it and I might try it on my 01 wr426...sorry for the long messege and THANKS for the help!!!