When the choke control handle is pulled out, under the action of a cam lever with a spring, the air and throttle valves of the 1st chamber are set to the position corresponding to starting a cold engine.
When the starter is turned on, a vacuum is created under the air damper and fuel is injected into the diffuser through the fuel jet of the main metering system of the 1st chamber.
To prevent over-enrichment of the mixture, the axis of the air damper is displaced in such a way that the effect of vacuum on the damper is complemented by the action of a return spring.
After starting the engine, the air damper remains ajar, which provides the necessary lean mixture.
As the engine warms up, the choke valve gradually opens under the action of the actuator lever cam.
Details of the GM Varajet II carburetor with automatic starter:
1 - carburetor cover;
2 - air damper;
3 - enrichment valve of the 2nd chamber;
4 - stopper of the regulating needle of the jet of the enrichment valve of the 2nd chamber;
5 - axis of the enrichment valve of the 2nd chamber;
6 - axis of the air damper;
7 - pneumatic actuator of the air damper;
8 - cover of the automatic starting device;
9 - lever drive accelerator pump;
10 - carburetor cover gasket;
11 - piston;
12 - adjusting needle of the main fuel jet of the 1st chamber;
13 - main fuel jet of the 1st chamber;
14 - float mounting bracket;
15 - float;
16 - needle valve and needle valve seat;
17 - needle valve seat seal;
18 - accelerator pump piston;
19 - fuel filter and fuel supply pipe;
20 - electromagnetic shut-off valve;
21 - adjusting screw for the amount of idle mixture;
22 - thrust drive accelerator pump;
23 - quality adjusting screw (composition) idle mixtures;
24 - throttle body;
25 - carburetor body;
26 - axis;
27 - adjusting screw for slightly opening the throttle valve of the 1st chamber;
28 - locking mechanism.
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