06400-ZX2-C00 Gear Kit - Overview. The 06400-ZX2-C00 Gear Kit is an essential transmission gear set designed specifically for Honda marine engine systems. It plays a vital role in the drivetrain system by enabling smooth and efficient transfer of power from the engine to the impeller, which is critical for reliable marine vehicle operation. Engineered to integrate seamlessly with existing components, this gear kit maintains optimal performance and durability in demanding aquatic environments.. K