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The problem may be within the carb itself. the compensator jet passage has a flow restrictor in the bottom that erodes (rusts) away. If the hole gets too big the idle goes lean. I don't have the exact drill size with me right now but its around a #47 or a bit smaller.

It looks as if it is a carb that requires preheat ( because of the metal shields ) as if it might be for use with diesel or kerosene.