2002 wr426 bike runs ok all the way through unless you crack the throttle then it just cuts out and stays like that if you keep it held open. As soon as you let off just a little bit it takes off. Right now I have stock carb accept a 170 main, white bros tapered pipe, R4 silencer, yz cam timing, bk mod, and the air box lid off. I have tried 48 pilot, and adjusting the air screw. I have tried adjusting the accelarator pump all the way to shut off. None of this has changed a thing to keep it from cutting out. If anyone has a good idea of what might be wrong I would really appreciate your help.