B2 will make a big diff for acceleration. Just curious, did you do any break in before going riding with your friends? By the way I just clocked mine to B2, I didn't have to make any tools to hold the clutches. The primary had 4 holes, you can pick 2 holes and stick two long bolts in them than hold it in place with a bar while you torque it. The secondary was a bit harder but I ended up using a long bar grabbed an outer fin at a right angle and put a block of wood under the bar to hold that in place. Both the buts came off with the impact so I didn't have to hold anything on removal.