If this happens while you;re accelerating, I'd think it was a problem with jetting. Did you buy this bike used? If not, where are you located? If someone tampered with the intake or something they could have made minor adjustments to the mid-range jetting that are not allowing proper fuel flow.
If your bike is stock, you might simply have a problem with the altitude where you live.
Aside from that, you may just need to clean your carbs out. Some old gunk could be holding the little moving parts back or gunking up some flow passages.
All gas has detergents in it. These detergents leave residues inside the carb that will collect if the bike ever sits for awhile or isn't used regularly.
Let me know,
Jonathan
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