The motorcycle starts without issues even when cold.
It functions normally at any position of the choke.
When it is still cold and you try to open the throttle, it bogs like on the video (see YouTube link below).
When it is warmed up after some minutes the problem is getting smaller. I can open the throttle, drive, but it bogs sometimes on the road unexpectedly. At the moment that it bogs on the road, if I manage to open the throttle excessively, and if the rpm manages to get high, then it stays there with no issues for some time, but it can still bog at one point (highway drive).
I noticed the problem for the first time while I was on the highway, where it started to bog at some points, but nothing serious. As time went by, it became undrivable.
Here is a video of the issue that I uploaded on YouTube
I checked and confirmed that the following work as they should:
the air flow
If you have other ideas, please let me know.