90017-RWC-A01 bolt-washer (16x49) - Overview. The 90017-RWC-A01 bolt-washer (16x49) is a crucial component designed for Honda marine engine systems. It plays a key role in securing the crankshaft pulley and other vital engine components, ensuring structural integrity and operational reliability. Manufactured to strict OEM standards, it guarantees a precise fit and long-lasting performance, integrating seamlessly with existing hardware for optimal marine engine function.. Key Features. Genuine OE