90518-ZVP-000 Gear Shim A - Overview. The 90518-ZVP-000 Gear Shim A is a precisely engineered component within Honda marine engine systems. This specialized shim plays a vital role in the transmission system by maintaining exact gear spacing, which ensures smooth and efficient power transfer. Essential for the reliability and performance of Honda marine engines, it helps uphold the system's mechanical integrity and operational precision. Designed to integrate seamlessly with existing parts, the