Im running a tb108 right now with a 20mm carb. I am running a two bros exhaust. With the new style TB rh. Im not really happy with the performance im getting out of it and it kinda seems like a 20mm carb is too small. This motor has no power in the top end at all. And cant even rev out in fourth gear at a slight incline. How much difference do you guys think a 24mm carb would make??