The problem sounds fuel related being that a partial choke improves the running.
Some things to check:
Try loosening the fuel cap. Could be air locking, drawing a vacuum on the tank as fuel is used/temp changes. Don't trust a cap just because it says "vented", sometimes they are not.
I doubt it has a fuel pump, but check it if so equipped.
There is a plug in the bottom of the carb. Try removing the plug, with the fuel valve on (idling if it has a fuel pump) catch what comes out in a clean glass. You should get a full flow until the bowl empties, then reduce to a steady stream. If it slows to a drip or stops, the fuel is not getting into the carb. Check for restrictions up stream, there may also be a screen in the carb fitting where the fuel line attaches. Also look at what came out, is it clean? Water? If it's cloudy or gritty the carb may need the bowl dropped and cleaned.
Check the fuel line. It should be steel, not copper. It needs to be routed as far from the exhaust as possible. If it is a gravity flow system no paper or bronze filters. You can add a screen type if needed.
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