Re: Throttle linkage
Nah! My fault for misreading. When I read it just now, I realized what you meant before I got to your reply.
There is no set length on the threaded rod. You adjust it so that both ends are substantially equal. You adjust so that the cam just touches the carb roller and the roller contacts the cam either on the mark if a single mark or between the marks if it has two marks. This is done with the carbs fully closed. then you check to see if at wide open throttle, the carb butterflies are substantially horizontal--a slight bit off and the engine will not even notice. Then, idle speed is adjusted ---so the mark(s) may or may not be on the roller after adjustment.
Do not tighten the lock nuts too much. to do so will eventually crack the plastic ball fitting.