11300-ZW9-406 Crankcase Cover - Overview. The 11300-ZW9-406 Crankcase Cover is a vital component in Honda marine engine systems. It functions as the protective outer shell that encloses the crankcase assembly, safeguarding internal engine parts from contaminants while maintaining oil containment. This ensures the engine operates reliably and efficiently. Designed to integrate seamlessly with existing parts, it maintains optimal performance and durability.. Key Features. Genuine OEM Honda Crankca