Altitude Compensator

Fig. 7 Electrical type altitude compensator:

Electrical
The electrical type altitude compensator, Fig. 7, is mounted on the ignition module. The compensator improves emissions and aids engine performance at altitudes above 4000 ft. by advancing the timing and leaning the air/fuel mixture.

Fig. 8 Mechanical type altitude compensator:

Mechanical
The mechanical type altitude compensator, Fig. 8, is mounted on the bulkhead. The compensator leans the air/fuel mixture at altitudes above 3000 ft. by supplying additional filtered air to the carburetor.