Solas yd-cd-13/19 Concord Yamaha impeller has unique blade design that delivers remarkable thrust take off, Solas yd-cd-13/19 impeller improves acceleration and top speed. Solas Yamaha impeller is great for pulling skiers to racing 2+mph. This upgrade over stock Yamaha impeller fits GP1200 97-99, GP1200R 1999. 66f-r1321-00-00 65u-51321-a0-00