your problem is not in dirty carbs.... there not in sync.... you need a sync tool that mesuars the air that each carb is sucking... there pretty cheap if you get a cheap one.... other than that if your not running hot, or dont smell like your running rich your probobly just do for the syncronizing, if each carb is sucking the same ammount of air, then there wont be one or two holding other ones back... witch is probobly what your experiencing :grin: