The carb-setting procedure is the same for ALL of the O.S. pumped engines. With the pump, you don't worry about the engine leaning as the level of fuel in the tank drains.

The pump/carb system used by the O.S. Max .61 SF/RF system had four nipples on the pump and two on the carb. The pump had fuel in, fuel out, the "S" port that used vacuum from the carb, and the "R" line that returned excess fuel to the tank

The carb had two nipples. The one right at the needle valve took fuel from the "OUT" port of the pump. The nipple that was lower and inboard was connected to the "S" port of the pump. If you look into the carburetor, you can see a small hole in the venturi just behind the butterfly valve. When the vacuum of the carb changed with throttle setting, it would affect when the pump started returning fuel to the tank. This lowered the fuel pressure to the carburetor at lower throttle settings and helped give a more-linear response to throttle.