why ist that one pot can run leen
well the most common reason given here and elsewhere is simply that one pot draws more mixture in than the other, usual answer is to try a biased washer between the carb and the manifold to direct more fuel mixture to the side that's lean.
However that raises an interesting question, although the mixture drawn into either potmight be different in volume it should be the same in regard to the petrol/air ratio so maybe the term weak or lean in this instance is inaccurate, if indeed the mixture petrol/ air ratio is different then possible causes could be worn valve guides or air being sucked into one side of the carb gasket.
Anyway lowbrow thanks for allowing me to forward an alternative view, lets see what the wiser heads make of it