Remove the air supply cover and disconnect the throttle control rod from the lever.
After loosening locknut 1, unscrew screw 2 until stop 3 is released.
Touch the throttle valve with your fingertip and screw in screw 2 before it begins to move.
In this position, turn screw 2 another half turn and tighten lock nut 1.
Lock screw 2 and lock nut 1 by dripping some paint on them.
Connect the throttle control rod to the lever and adjust the throttle actuator if necessary.