11820-ZY3-000 R Timing Belt Cvr - Overview. The 11820-ZY3-000 R Timing Belt Cvr is a genuine OEM timing belt cover designed specifically for Honda marine engine systems. This essential component protects the timing belt, a critical part of the engine's operation, ensuring the timing mechanism remains secure and reliable during performance. Manufactured to meet exact factory specifications, this timing belt cover integrates seamlessly with existing hardware and seals, preserving optimal performan