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Just a thought but have you checked the condition and adjustment of the air screws underneath the carb that are so hard to adjust when the carbs are installed. They have a very fine end that can break off and if the “O” ring is damaged or the small flat washer that holds the “O” ring in place under the spring is missing they can leak and cause problems. I mention them because I didn’t see them in your pictures so wonder if you have taken them out to check?
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Perpetua Culpa Alterna Vagus
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