I have just done the BK MOD on a 00' 426, problem is it would barely run after the jetting changes. The bike is completely stock, after the mod I tried these jetting changes: 1. 165 main 2. 45 Pilot 3. Raised needle(Lowered clip) one position. 4. Fuel Screw, 2 1/4 turns. I run 93oct pump gas, always Amoco. It ran terrible, popping and crackling. After alot of mechanicing, head scratching, and a few assorted word, I returned everything to stock. I am riding in the Atlanta,GA area. Can anyone get me a starting point?? I don't have to much knowledge of 4-stroke jetting clues, other than to trust what I feel. Thanks for the help!!!