90741-ZV4-000 Special (16X15) Key - Overview. The 90741-ZV4-000 Special (16X15) Key is a precision-engineered component designed for Honda marine engine systems. This specialized key supports the mechanical interface within the engine's drive pulley system, ensuring the reliable transmission of mechanical motion essential for engine operation. Its exact match to manufacturer specifications ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Feat