40201-ZY6-000ZD Case *NH565* - Overview. The 40201-ZY6-000ZD Case *NH565* is a genuine Honda marine engine component designed to support the extension case system. This part plays a crucial role in housing and protecting essential mechanical elements, ensuring the system operates reliably and efficiently. Manufactured to Honda's factory specifications, this case ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Extension case housing