I have a 18' Sailfish CC [1350lbs]with a 90hp Yamaha 2 stroke [261 lbs] which holds 52 gal of fuel[312lbs]. The boat came equiped wiht a 13.25x17p Yamaha aluminum prop. With me, the boat and motor, and all the gear will weigh about 2300 lbs. With this combination the boat ran; <br />4000 rpm 25...