The symptoms you posted sound like mixture issues caused by failed crankshaft seals to me. They make the engine run lean and typically get worse when the engine warms up making it run even more lean until it bogs out and dies. I don't think they are terribly challenging to swap. That said, the first step would be to replace any rubber hoses on the engine, then do a carb and fuel pump rebuild, the start looking at the seals. Unlike a 1 cylinder engine, I don't think you can easily pressure test the crankcase to prove the seals are bad.
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