15122-ME5-000 Rotor (Inner) - Overview. The 15122-ME5-000 Rotor (Inner) is a crucial OEM part within the oil pump system of Honda marine engines. It plays an integral role in the engine's lubrication mechanism by contributing to the mechanical motion and fluid flow inside the oil pump. This component supports the Honda marine engine system by maintaining proper oil circulation, which is vital for the engine's performance and longevity. Designed with precision to meet Honda factory specifications