Automatic carburetor starter: 11 - air damper; 25 - bimetallic spring; 26 - pneumatic drive of the air damper; 27 - air damper opening thrust when engine speed increases.
Air damper 11 (see picture) is held in the closed position by a bimetallic spring 25 and a system of levers, the throttle valve of the 1st chamber is slightly open, i.e. it has a starting gap that corresponds to a reliable start of a cold engine.
When the engine starts, the vacuum in the cylinders creates a significant suction effect with a limited amount of air.
After the engine starts running, the vacuum in the intake manifold acts on the diaphragm of the pneumatic drive 26, which slightly opens the air damper 11 in order to enrich the combustible mixture at a minimum level when the engine warms up.
As the engine warms up, the air damper is opened by a bimetallic spring, which is heated by a resistor connected directly to the battery charging circuit.
Original material on the website MAZbook.ru