50212-ZW6-305 Friction Block - Overview. The 50212-ZW6-305 Friction Block is a critical component within Honda marine engine systems. It supports the extension case system primarily used in Honda outboards, providing essential friction to control part movement and maintain operational stability. As a genuine OEM part, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. This friction block is designed specifically for Honda marine ex