Just working on my carb and saw something i wasn't to sure about. Does anyone know what the nut on the seat of the main jet is for? is there a standard it supposed to be set at? On the valve adjustment let me know if i'm correct. tdc on compression stroke int.06 exh.08. after i adjusted mine it ran stronger just harder to kick, they were to tight prior to adjustment. Is there an adjustment for the decomp from the kicker?