90548-ZY3-000 Shim A (2.75) - Overview. The 90548-ZY3-000 Shim A (2.75) is a precision-engineered 2.75mm thick thrust shim used in Honda marine engine systems to precisely adjust component tolerances for optimal performance. This part plays an essential role in maintaining the correct spacing and alignment of engine components, which is crucial to reliable and efficient engine operation. Designed to fit seamlessly within the thrust system of Honda outboard engines, it ensures seamless integratio