The main rocker shaft, with code number H 27032, is a core mechanical axis in the valve train of the ASL25 engine. It supports and guides the movement of rocker arms, translating camshaft motion into precise opening and closing of engine valves. Built for strength and stability, the shaft must endure continuous stress from reciprocating forces while maintaining perfect alignment for optimal valve timing. Proper lubrication and machining precision are essential for its longevity. As a backbone of the valve mechanism, the main rocker shaft significantly influences engine breathing efficiency and overall performance.