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Swap 2 carbs around, you may have a twisted throttle shaft.
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This is more than likely the issue. What happens is that one throttle blade is open slightly while the other is completely closed. You measure the one that's open and assume somthing is wrong with the other(?) it can't pull air it's closed. Try this to validate: Disconnect the link beween the two carbs on the bank that is flawed. Start the engine and then slightly increase the throttle opening on the carb in question, see if the carb comes on line and the engine starts running on all 8. If so you have a slightly twisted shaft. Use small 4 or 5 mm (??) on each end of the shaft to correct the twist, be carefull do it gently, this is one area you dont want to exert too much force.