No. The length of the rod between the governor lever and the governor spring is not critical. This rod needs only to pull the spring eye back far enough for the spring to make it run up to speed. If the spring is too weak to "get 'er up to speed" then he needs replaced. Adjust the stop bolt/bolts for the throttle lever limits as needed.
Remember, a governor is a system of balanced forces. The spring speeds 'em up & the governor's action slows them down. To compensate for loads the governor lets the spring win opening the throttle. When it's running too fast the governor wins by overloading the spring closing the throttle. Moving the spring's eye just changes the speed at which the "in balance" point takes place!