What’s inside an automatic choke of dellorto carburettor (PHVA or PHVB).
The choke works at around 12V. Max consumption in the first few seconds drops from 2A to 0.6 A and then gradually goes down to 0.2A, where it stays. The needle extends to max 8mm and it took it around 5-10mins.
Another nice video demonstrating the operation: https://www.youtube.com/watch?v=IVLHaVPf7SI