91304-ZY9-000 Oil Pump O-Ring - Overview. The 91304-ZY9-000 Oil Pump O-Ring is a critical component in Honda marine engine systems. This genuine OEM O-ring supports the oil pump system, playing an essential role in sealing the lubrication pathway to prevent oil leaks and maintain efficient engine lubrication. Designed for Honda Marine outboard engines, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Precise OEM component designe