Yamaha - Reed set - 689-W0004-00-00Yamaha Reed Set Intake System Component 689 W0004 00 00 Overview The reed set is a vital component of your Yamaha outboards intake system, controlling the flow of the air fuel mixture into the engine. Reed valves open and close with engine pressure, allowing the correct amount of mixture into the combustion chamber while preventing backflow. This ensures efficient combustion, smooth throttle response, and reliable engine performance. If the reeds