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Given that the carb you’re showing has a round slide and most of us use “flat slide” carb’s, there’s not much expertise here.
If air is allowed to leak through this hole, it MAY cause running issues, especially at idle and start up.
Simply putting “an old Mikuni” carb’ on your engine may create more issues than it solves. Putting the carb’ on that this forum’s participants use is the best way to extract expertise from this group.
My $0.02, FWIW.