40165-ZZ0-M01 Engine Side Stopper - Overview. The 40165-ZZ0-M01 Engine Side Stopper is a critical OEM component designed to support Honda marine engine systems. It functions primarily as a mechanical stop within the engine assembly, restricting or halting movement to enhance operational control and safety. This stopper maintains system integrity by ensuring key engine parts do not move beyond designated limits, thus preserving proper engine function and longevity.. Key Features. Provides precise