When you press the accelerator pedal before starting a cold engine, the throttle lever is pulled down by the accelerator rod; this opens the throttle valve. At the same time, the air damper in the carburetor is released.
The force developed by the bimetallic spring closes the air damper. As a result, a rich fuel-air mixture enters the engine during start-up and warm-up. With an increase in electric current heating of the bimetallic spring in the ceramic case of the automatic start-up unit, after 2-3 minutes the air damper opens, and at the same time the stepped disk rotates by the rod of the bimetallic spring so that the stop screw of the throttle lever begins to abut against the lower cavity of the stepped disk after dropping "gas". At this point, the engine is running at normal idle.
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