Yamaha - Reed Valve Assembly Air Intake & Fuel Control 6F6-13610-00-00. Overview. On a two-stroke Yamaha, how the engine breathes makes all the difference, and the reed valves are right at the center of that. I've worked on motors that just wouldn't idle clean or had a hesitation coming off throttle, and worn reeds were the issue. It's not always the first thing people check, but when they're not sealing right, you'll feel it. Replace the assembly, and the engine usually smooths out and responds the way it should.. Key Features. Controlled Intake Flow - Regulates air and fuel mixture entering the engine for proper combustion.. Improved Throttle Response - Helps restore smooth acceleration and consistent engine behavior.. OEM Precision Assembly - Built to Yamaha specifications for proper sealing and fit.. Durable Reed Construction - Designed to withstand repeated flexing under engine operation.. Restores Engine Efficiency - Supports balanced airflow for reliable performance.. Engine & B