Difficult cold start

Morgan, the request was for a video of the carb during cold cranking, however the video you posted does not show any pumping of the throttle before engaging the starter. You could have a suzuki motor under the hood for all that we can see. You've been given much good advice but seem to debate instead of follow, even though you are the one who is confused. Pics and video, not assertion.

I expect Finland has only high ethanol content fuel which leans the mixture if not adjusted for it. Few carbed vehicles are so finely setup that no throttle pumps are needed prior to cold start after a few days.

If you won't change anything else, then change your starting technique.