Yamaha Air Shroud Cylinder 1 7UH-12651-00-00. Overview. The Yamaha Air Shroud Cylinder 1 7UH-12651-00-00 is a genuine original equipment manufacturer component designed to direct airflow efficiently around the engine cylinder. This shroud plays a critical role in maintaining proper cooling by guiding air over the cylinder, helping regulate temperature and support consistent engine performance.. Built to Yamaha's exact specifications, this air shroud ensures a precise fit and dependable functiona