Yamaha Gear 1 6U1-WS455-01-00. Overview. The Yamaha Gear 1 6U1-WS455-01-00 is a genuine original equipment manufacturer component designed to support smooth and efficient mechanical operation within your Yamaha system. This gear plays a vital role in transferring motion and maintaining proper timing, ensuring consistent and reliable performance.. Engineered to Yamaha's exact specifications, this gear provides a precise fit and dependable durability. It is an ideal replacement for worn or damaged