Loosen connecting rod 1.
Unscrew the four Phillips head screws 2 and the hexagon socket head screw 3 securing the carburetor cover.
Remove the 1st chamber throttle position potentiometer and air damper servo together with the mounting flange.
Remove the carburetor cover, at the same time disconnecting the spring 4.
Install the carburetor cover in reverse order. Install the air damper servo so as not to deform the link connecting it to the air damper valve.