you might be able to clear up a mystery for me here ? i was messing about with an inazuma frame/project, i was gona use a b12 engine but i only had a set of b600 carbs i was gona use till i got a set of b12 carbs. the 32mm b6 carbs and rubbers went on no problem ( i know the 1200 zuma uses 32mm carbs as does the 1200ss ) but when i opened the throttle it moved just a few mm ? the middle balance adjuster touches the cam chain tunnel on the head. when i looked up zuma carbs they where the same !! i checked the zuma rubbers part number and they where just for that model, so my guess is are the rubbers longer than the 600 so the adjuster will clear ? i couldn't get hold of a set to measure to confirm !!!!