Sounds like a bad power valve... Old gas is real bad on carbs and may be causing a float to stick or a lot of other internal carb issues.
IMO you are slowly killing your engine. You need to get out and run it and get the temps up if you want that mill to live. Damaging moisture and contaminates collect in the oil and won't burn off unless your engine is run for about 20 minutes at operating temp. You'd be better off preping the engine for storage and putting it away until your ready for it.
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