90704-634-000 Key (4.5X11.0) - Overview. The 90704-634-000 Key (4.5X11.0) is a crucial component within Honda marine engine systems, designed specifically to secure and align the crank pulley to the crankshaft. This small yet vital key ensures the transmission of rotational force with precision, enabling smooth mechanical motion and overall engine reliability. Manufactured to exact factory specifications, it guarantees seamless integration with existing parts, maintaining optimal performance and