90521-ZV5-000 Shim (40X46X0.50) - Overview. The 90521-ZV5-000 Shim (40X46X0.50) is a precision-engineered component designed to support the mechanical system within Honda marine engine assemblies. This thin, flat gear shim plays a crucial role in providing exact spacing and alignment, which is essential for ensuring reliable and smooth operation of the engine's internal gear components. Crafted to meet factory specifications, it ensures seamless integration with existing parts, maintaining optim