A pair of rock arm assemblies designed for YBR125 quad engine cylinder components.This part is compatible with model number ZAA-H5540-00 and functions as a mechanical linkage within the engine's valve train system.The assembly helps transfer from the camshaft to the valves, contributing to the engine's operational cycle.Constructed for and consistent performance, it is intended for use in four-wheeled all-terrain vehicle engines.Each set includes two rock arms for complete side-by-side installation.