Skat-Trak’s Kawasaki impeller is recommended with a 12/17 750/900* or 10/18 750 Standard** pitch in an 140mm pump. This is recommended for a stock Engine only. If you have modification to the engine and watercraft, please give us a call so that we can recommend you with the correct impeller application. *Suggested for maximum bottom-to-mid range acceleration gains.**Sugested for maximum top speed gains.