40201-ZY3-612ZB Case Nhb14m - Overview. The 40201-ZY3-612ZB Case Nhb14m is an essential extension case designed specifically for Honda marine engine systems. This component supports the reliable operation of Honda outboard motors by providing a durable, perfectly engineered housing extension that integrates seamlessly with the engine's lower unit. Crafted to meet precise factory specifications, it ensures optimal durability and flawless compatibility, thereby maintaining the marine engine's over