Is this the right size prop?

[Hoonin]

I have a 1988 18' Javelin 378 fish & ski with a 1988 Evinrude 150 on it. The boat will run 40-45 mph @ 4000 rpm. I can only get 4000 rpm @ wot. The prop on it is a stainless steel 14 1/4 X 24. Is this the right size prop for this motor? The motor is also set in the lowest position on the transom, would raiseing it help my performance? Thanks for any help.

 

[steelespike]

Re: Is this the right size prop?

If you have no ventilation problems the motor is probably too low.raise it to a point just before venting becomes a problem.Be sure it pumps water.
Probably won't give you enough rpm to reach the 5,500 you need to be at,
but will give you a more accurate indication of the prop you need.Each inch change in pitch will net about 200 rpm you'll probably end up at a 17 or 19.
Try to stay with stainless same brand.