Yamaha - Air Shroud Cylinder 3 Cooling System Component 7FK-12653-00-00. Overview. This air shroud is one of those behind-the-scenes parts that keeps your engine running the way it should. It directs airflow around the cylinder, which matters more than most people think-especially when you're running hard or idling in heat. I've seen engines run uneven just because airflow wasn't being guided properly. Keeping this piece intact and fitted right helps the motor stay consistent and reliable.. Key Features. • Targeted Airflow Control - Directs cooling air around cylinder three for balanced engine temperatures.• OEM Fit and Shape - Designed to match factory layout for proper airflow routing without gaps.• Heat-Resistant Build - Holds up under engine heat and vibration in marine conditions.• Supports Even Cooling - Helps prevent hot spots that can affect performance over time.. Engine & Boat Compatibility. Designed for Yamaha outboard engines that use cylinder-specific air shrouds as part o