Hmmm. Maybe try this test just to prove it is a fuel problem. Rev it up and get it to stumble and ready to stall, then spray a shot of WD-40 in the carb and see if it wants to take back off and rev. It sure acts like it is running out of gas. How about the fuel tank coupler? If that had a problem it would still give you a shot of gas out of the disconnected hose because the hose was full but maybe its not coming out of the tank properly.
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