40201-ZW9-C10ZB Case *NHB14M* - Overview. The 40201-ZW9-C10ZB Case *NHB14M* is an essential component of Honda marine engine systems. This extension case functions as a protective housing, supporting the integrity and reliable operation of the engine's mechanical systems. Specifically crafted to fit Honda outboard motors, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This OEM Honda case extension is designed to protect interna