Yamaha - Reed set - 69L-W0004-00-00Yamaha Reed Set Intake Air Control System 69L W0004 00 00 Overview On a two stroke Yamaha, the reed set is what keeps airflow moving clean and controlled into the engine. When everythings sealing right, you get that crisp throttle response and smooth pull through the range. But once the reeds start to chip or lose tension, the engine feels offhard starts, hesitation, or weak power. Its one of those parts that makes a noticeable difference the moment