i recently upgraded my 400ex to a 426 now i can't seem to get it going right. bike runs great ideling but when i try to ride it when i hit the gas it cuts out. changed my pilot jet to a 50 and 148/165/180 in main still doing the same thing. could it be revving out to fast or what? Please help ready to ride this thing!!!!! oh yeah air filter box top has 6 1inch holes in it.