40201-ZW9-631ZB Case Nhb14M - Overview. The 40201-ZW9-631ZB Case Nhb14M is a crucial component of Honda marine engine systems. This extension case supports the gear case system by housing vital parts securely, ensuring seamless protection and operation of internal mechanisms. Designed specifically for the NHB14M model, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This part serves as an extension case for the gear system in Ho