2. Disconnect the two-pin connector of the air damper heater.
3. Fully open and close the throttle valve, allowing the choke plate to close completely.
4. Start the engine, the air damper plate should partially open.
5. Check the clearance between the choke lever tab and the carburetor body.
Choke lever paw
6. Allow the engine to warm up to at least 25°C.
7. In this case, the air damper lever tab should rest on the carburetor body.
8. Otherwise, disconnect the vacuum tube from the air damper opening mechanism valve "A", connect a vacuum gauge and check for vacuum in tube "B".
Air damper opening mechanism valve
9. If you have verified that there is a vacuum in the tube "B", then connect a vacuum pump to the tube "C" of the air damper opening mechanism valve, create a vacuum in the valve and make sure that the rod "D" of the air damper opening mechanism moves completely.
10. If the air damper opening mechanism rod moves normally, check the serviceability of the thermal valve.
(Information obtained from this source: «HondaBook.ru»)