91051-ZW1-003 Bearing - Overview. The 91051-ZW1-003 Bearing is a critical tapered roller bearing used in Honda marine engine systems, specifically designed to support rotating components within outboard motor gearcases. It ensures smooth and efficient operation by reducing friction between moving parts, contributing to the reliable performance of the engine. Engineered to meet exact factory specifications, this bearing integrates seamlessly with existing parts, maintaining optimal durability and