Solas yb-cd-14/18 Concord Yamaha impeller has a unique blade design that delivers remarkable thrust take off, improves acceleration and top speed 2+mph. Solas yb-cd-14/18 impeller is great for pulling skiers to racing as. Solas This upgrade over stock Yamaha impeller fits GP800 98-00, Fits Mod 701. repl 66e-51321-b0-00