50201-ZY9-020ZB Case Nhb14m - Overview. The 50201-ZY9-020ZB Case Nhb14m is a genuine Honda OEM swivel case component designed specifically for the NHB14M system in Honda marine engine setups. This crucial housing part plays a vital role in supporting the mechanical functions and structural integrity of the outboard system, ensuring reliable operation over time. Precision engineered, it seamlessly integrates with existing parts to maintain optimal performance and durability in Honda marine engine