Yamaha - Reed Set Intake System Component 6H4-W0004-00-00. Overview. Reeds are one of those parts you don't see working, but you definitely feel when they're not. I've dealt with motors that just wouldn't idle clean or had a hesitation off throttle, and worn reeds were the culprit more than once. When they seal right, the engine breathes properly and runs smoother across the range. It's a small upgrade that can make a noticeable difference in how the motor responds.. Key Features. Improved Airflow Control - Regulates air intake for efficient combustion and smoother engine response.. Responsive Reed Action - Opens and closes quickly to match engine demand.. Durable Reed Material - Built to handle constant flexing and engine vibration.. Factory-Spec Fitment - Designed to match Yamaha intake systems for proper sealing.. Restores Engine Smoothness - Helps eliminate hesitation, rough idle, and power loss.. Engine & Boat Compatibility. Designed for Yamaha outboard engines with compatible two