40201-ZY3-612ZD Case Nh565 - Overview. The 40201-ZY3-612ZD Case Nh565 is a genuine Honda marine engine component designed specifically for Honda Active Marine systems. This essential case extension supports the structural integrity and proper housing of marine engine mechanisms. By maintaining factory-grade specifications and fit, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. OEM Honda part ensuring exact match to original fac