Air Valve Spring Adjustment

Fig. 16 Air valve spring adjustment:

1. Loosen lock screw, then turn adjusting screw clockwise until air valve is partially open, Fig. 16. It may be necessary to remove the intermediate choke rod to gain access to the lock screw.
2. Turn adjusting screw counterclockwise until air valve just closes, then continue turning counterclockwise the specified number of turns. Tighten lock screw.
3. Lubricate air valve shaft pin and closing spring with lithium base grease.