I have roots from your country.
That carburetor is not fun to deal with.
Look at this.
https://www.stovebolt.com/ubbthread...b-and-bc-work-revisited.html#Post1456274It needs good intake vacuum, to keep the power piston held up and not allowing it to go over rich, as well as the power piston and feed to it not leaking, and also not plugging up the port at the bottom of the carb flange.