I don't have a clue on how to test pressure or volume on that one. Maybe you could let her run out of fuel and then see which bowl has the least amount of fuel by removing the bolt that pinches the float bowl to the carb housing. (The dry one will only drip for a few seconds) Or better yet mix you some 2-stroke blended fuel in a squirt can and give the motor a little squirt just as it starts to run rough. (right down the throat of the carb(s).) The motor should pick up and indicate the one that is going dry. I was going to say it would be OK to keep it running on carb spray but no lubrication there. If I remember right my old 50 would run on 2 cylinders when the other 2 weren't 100%. But the other 2 were flooding out, needle stuck. Did you go into the fuel pumps when you went into the carbs?
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