WASHER 90506-ZX2-C00 - Overview. The 90506-ZX2-C00 Washer is a genuine Honda marine engine component designed specifically for propeller thrust applications in Honda marine engine systems. It plays a critical role in securing propeller hardware, distributing load, and preventing leakage, thus ensuring smooth and efficient operation of the propulsion system. The washer supports the propeller system by providing a flat surface beneath securing nuts or bolts to maintain proper mechanical alignment