the 400ex is a damn reliable quad and i have beat piped and stock z's with mine when it was all stock, skills is probly why. now mine hase a pipe k&n and jetting but havent lined up with a z yet but the 05 will prob kill me with the new cam. my friend is getting an 05 ex in a couple of months so ill see if the gearing is different, hopfully first isnt so low.
spud