It is a moot point that the tank has sufficient fuel,
it is not getting to the engine is the problem.
As a engine works harder it requires more fuel.
Sounds like that is not happening.
Might try seeing if the flow of fuel TO the carb is good, if not investigate why and take remedial action.
If the flow IS sufficient then there is a reduction into the carb or the carb itself is partially clogged.
Have you tried to simply adjust the main jet richer?
that could cause a problem also.
Let us know what you diagnosed, so we can help
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