There intolerance to moisture was the reason Evinrude resisted using anti friction bearings on service motor powerhead main bearings for so long. Yes, those rust spots will accelerate the ware on the rollers. If you are only using it a few hours a month at OMCI meets, it will probably give many years of service. If you want an outboard for dependable heavy summer family use, I would find a good crankshaft. . . 😉
