Does it sound like its breakin up?? Like spittin and sputtering like the choke is on?? If so, then your running too rich on either the pilot or needle...Does it idle and start great?? If so, then leave the pilots for now...Lower the needles...I normally suggest to raise them, but larger pilots will affect the needle height and will have to lower them because of this...I only suggest larger pilots for Pc pipes since they run so lean on the bottom...try lowering the needles to the 2 clip from the blunt end and go from there...You can also diagnose quickly by taking the air box cover off, this will lean it out and give you a lot more hp..the air box holds back a lot...Try the air box cover first, if it still persist then try lowering the needles, if it still persist then try disconnecting the tors above the left exhaust and the parking brake switch....another thing to check is to make sure you put the equalizer tube back on between the carbs after you pull them out....