40201-ZY6-000ZB Case *NHB14M* - Overview. The 40201-ZY6-000ZB Case *NHB14M* is a critical component within Honda marine engine systems, specifically designed as an extension case housing. This part plays an essential role in protecting and containing internal components of the marine engine, ensuring the system operates reliably and efficiently. By providing robust structural support, it guarantees the longevity and smooth functioning of the surrounding mechanical parts. Designed to fit seamless