My 2002 426 has a serious bogging problem and is connstantly fouling plugs. BK carb mod installed (very precisely). Current jetting is 1 3/4 turn pilot screw, 42 pilot, dropped needle 1 clip (3rd position), 160 main. Stock exhaust. If the bike runs long enough, the plug fouls with carbon, often sooner with fuel. Crack the throttle under load and the thing falls on it's face. Not exactly confidence inspiring. Any suggestions??? Never had these problems with the 2000 426.