Just got this boat this spring with no motor.Rated for a 90 hp motor.Purchased a 1984 90 hp mercury and installed it.Currently has a 13.25 X 17 prop.Took it out to test it today and it runs around 4400 rpm's at wide open throttle and doesnt want to plane properly,seems to be diving front end down more than it should and cant bring it up by raising trim.Jumping ahead of myself i ordered a new prop yesterday,a 13.25 X 15 prop.Joined this group today and after reading some prop threads it seems i may have to go lower on pitch than what i ordered.Was told motor should run around 5400 rpm's.Any one have any advice on prop pitch and rpm's?I would appreciate it.Thanks, Jamie