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Fuel line to the front carb. looks to rise a bit before it heads downward to the float bowl. Remove the filter ( both of them) and the fuel lines will head downward and not trap air in the high spots which stops the flow. How do you expect to balance the airflow through the dual carbs, the exhaust is in the way. That's the first step in setting up the carbs. so one isn't rich and the other is lean while it idles on only one?