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I've seen internal cracks in carbs through magnafluxing them and it isn't too terribly common, but it sounds like you got one with a crack in it. If your other carb works fine on the engine, then the only thing that has changed is the carb. If one side is running lean, perhaps the jetting is incorrect/worn on one side. I do not know anything about a demon carb; I've never heard of them so all I can offer is basic knowledge. So my advice would be to take the carb to someone who could tune it or diagnose it-it may be expensive, but a bad carb can ruin a good engine.
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