As I understand (some) things, the 4/6 motors came with the Mikuni carburetors. It was the 81-82 Ltds that came with the 'other' type of carburetors.
My question is what jetting is in the 4/6. I can but assume since the motor puts out more Hp than a standard round head they must be larger.
What is the correct jetting for the 4/6