90520-ZX2-C00 Gear (0.30) Shim C - Overview. The 90520-ZX2-C00 Gear (0.30) Shim C is an essential component in Honda marine engine systems. This shim is designed to precisely adjust the spacing between gears, playing a critical role in maintaining the smooth operation and longevity of the engine's gear system. By ensuring correct gear mesh and alignment, it reduces wear and tear and supports reliable marine engine performance. Engineered to fit perfectly with existing parts, the shim ensures sea