Divide And Conquer
BC
As you have noticed in the comments so far there can be many causes of fuel starvation.
Here's how to speed up the diagnosis a bit. Get the carb as clean as possible and the fuel pump working as well as possible then attach an auxiliary tank with clean fuel to the fuel pump and see what happens. This will tell you if the problem is before or after the fuel pump.
Word of warning: Serial cleaning of the carb will not solve the problem.
TRUE GRIT
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