90556-ZY3-000 Shim I (2.70) - Overview. The 90556-ZY3-000 Shim I (2.70) is a precision-engineered thrust shim used in Honda marine engine systems. It plays a critical role in providing accurate spacing within the marine engine's propulsion system to maintain proper alignment and smooth operation. This component ensures reliable performance by preventing undue wear to adjacent parts and contributes to the overall longevity and efficiency of the engine.. Key Features. OEM genuine Honda shim designed specifically for marine engine thrust applications.. Provides precise 2.70mm thickness for optimal mechanical spacing.. Manufactured to meet exact factory specifications and tolerances.. Integrates cleanly with existing hardware, seals, and housings in the thrust system.. Supports smooth mechanical motion and alignment within the propeller shaft assembly.. Maintains expected durability and consistent performance throughout the engine's lifecycle.. Why Choose Genuine OEM. Using original Honda