The carby that you installed where did you get it from?
Has it the same jets as your other 3?
Did you have your carbies balanced after you installed it?
Did you replace the ring between each carb?
Are they all the same serial numbers?
Also what type to of anti theft system installed.
1 - I bought a set of 4 used carbs on ebay, used only the one I needed because mine looked to be in better condition
2 - Yes, I changed all the jets from my old carb as they were all usable and recently bought
3 - No, this is what I am planning on doing this week once my sync tool gets here
4 - I didn't replace any rings, just reused the ones that seemed to be in better condition
5 - I didn't check but they seemed to be exact fit. Only thing that was different was the way that the fuel line wrapped around the carb
I don't know what type of anti-theft system is on it off-hand, I'll have a look and come back to you on that one.
As for the OP, I resolved the issue by properly adjusting the air-fuel mixture screws to a smidge over 2 turns on all carbs. At the time of video it was not an accurate adjustment so I guess that is what it was.