When the air damper control handle is pulled out, under the action of the 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 air damper axis is shifted in such a way that the action of the vacuum on the damper is supplemented by the action of the return spring.
After starting the engine, the air damper remains slightly open, which ensures the necessary lean mixture.
As the engine warms up, the air damper gradually opens under the action of the drive lever cam.
GM Varajet II carburetor parts with automatic starting device:
1 - carburetor cover;
2 - air damper;
3 - 2nd chamber enrichment valve;
4 — stopper of the regulating needle of the enrichment valve jet of the 2nd chamber;
5 — axis of the enrichment valve of the 2nd chamber;
6 — air damper axis;
7 — pneumatic drive of the air damper;
8 — Automatic starting device cover;
9 — accelerator pump drive lever;
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 — idle mixture quantity adjusting screw;
22 — accelerator pump drive rod;
23 — adjusting screw for idle mixture quality (composition);
24 — throttle body;
25 — carburetor body;
26 — axis;
27 — adjusting screw for opening the throttle valve of the 1st chamber;
28 - locking mechanism.
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