The center lines of the carburetor bores must be parallel both horizontally and vertically. If they are not, loosen the mounting screws and align the carburetors on a flat surface.
Retighten the mounting screws.
After installing the choke mechanism, check to see that the starter plunger lever slides right to left smoothly without abnormal friction.
Caution! Fuel mixture trouble could result if the starter plunger does not seat properly in its rest position after the choke lever is returned.
Visually synchronize the throttle (butterfly) valves.
Check to see that all throttle valves open and close smoothly without binding when turning the pulley.
Visually check the clearance [A] between the throttle valve and the carburetor bore in each carburetor.
If there is a difference between any two carburetors, turn the balance adjusting screw [B] to obtain the same clearance.
Install the carburetors (see Carburetor Installation).
Adjust the synchronization (see Synchronization Adjustment).