What do your plugs look like? Big difference between banks?
Are you sure that your pilot screws on the carb are adjusted correctly? On many models the settings are different for port and starboard.
After that I'd probably pull the carbs and clean them and then if the problem was still there check/rebuild the fuel pumps.
That's all cheap stuff to do.
That motor doesn't have the computerized ignition (YMIS) correct?
Steve P.
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