90560-ZY3-000 Shim M (2.50) - Overview. The 90560-ZY3-000 Shim M (2.50) is a precision thrust shim designed for Honda marine engine systems. It plays a critical role in making accurate mechanical adjustments to ensure proper alignment and clearance within assemblies, which helps maintain reliable engine operation and performance. Designed specifically for Honda outboard marine applications, this shim complements the thrust and propeller shaft systems to prevent excessive wear and enhance durabil