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is the rubber manifold in good condition ?

sometimes they split and you dont see it. if you have carb spray, you can spray it around the manifold, and if the rpm changes, thats the problem.

it also could be the valves not in spec, or a timing issue with the tensioner or stretched chain ...

you put a new carb on the bike ? there should be an air/fuel mix screw that might fix it also, be patient, when you turn it, it might take a bit to "kick in" ... trial and error, but screw should be 2 1/2 - 2 3/4 turns out from all the way in ...

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