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Hmmm...not too sure but I'm curious why the 2 right rear cylinders.Are you sure it's a fuel problem? Are you getting good spark at those cyinders?
what intake are you using ?normally if the 2 right rear cylinders are full , both sides of the carb are flooding on a dual plane intake dirt in the needle & seat will flood the carb , are you using a fuel filter & has it been changed recently ?