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Does it run that nibbi carb or the stock carb when it has this problem, or is that not you in the above video?
If you don't have a nibbi on this bike, yes you can simply order one and jet it accordingly. Otherwise, unsealing the stock carb and jetting it is also an option.
The only way to know for sure if it is something fueling related would be to do a plug chop, but if you think it is that lean I would almost be concerned that you may be on the verge of a soft seizure, which is why it slows down and needs a moment to recover. That would happen if it is very lean at wider throttle positions. Basically, the piston is getting hot enough from the lean burn that it's expanding faster than the cylinder.
You could do the simple man (my approach) and put a larger main jet in and see what happens. If you are lean, this will make your symptoms reduce or go away entirely. If rich, it will get much worse lol.
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