Yamaha - Reed Valve Assembly Air Intake & Fuel Control 6H5-13610-00-00. Overview. On a two-stroke Yamaha, the reed valves are a big part of how the motor breathes, and when they're not sealing right, you'll feel it immediately. I've worked on engines that just wouldn't idle clean or had a hesitation off throttle, and it often came back to worn reeds. It's not always the first thing people check, but it makes a noticeable difference when it's right. Swap in a fresh assembly, and the motor usually wakes right back up.. Key Features. Controlled Airflow Function - Regulates air and fuel mixture entering the engine for proper combustion.. Responsive Throttle Behavior - Helps improve engine response and smooth acceleration.. OEM Precision Assembly - Built to Yamaha specifications for proper sealing and fit.. Durable Reed Construction - Designed to handle repeated flex cycles under engine operation.. Restores Engine Efficiency - Supports consistent intake flow and overall engine performance..