12341-RTA-000 Cyl Hd Cvr Gasket - Overview. The 12341-RTA-000 Cyl Hd Cvr Gasket is a vital sealing component designed for Honda marine engine systems. It plays an essential role in preventing oil leaks and maintaining proper engine compression by creating a tight seal between the cylinder head and its cover. Manufactured to match factory specifications, this gasket ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM compone