Prop Replacement - Rebuilt Boat

[FBCoach]

I rebuilt a runabout and believe the boat is much heavier now. It's a 20' Bombardier Celebrity with a Mercruiser 4.3 LX with Engine number 0K158135 and Drive number 0K068222. My prop is a three blade 14.5 with 19 pitch. My WOT speed is about 33-34 MPH and the boat is slow to plane. Hit a stump today and one of the blades broke off. Any suggestions on what to replace it with? Thanks in advance.

 

[jimmbo]

What WOT rpms were you getting with the current prop?
a 20ft boat is a lot for a 4.3

 

[FBCoach]

4800

 

[FBCoach]

We live on a HP limited water shed. I am the second owner. I believe the previous owner wanted a large boat, but was limited by the motor. May not have been the best decision, but its what we are working with.

 

[jimmbo]

You are already at the top of the WOT RPM range. I guess you could drop 2 - 3 of Inches in Pitch, and add another Blade. You will lose Top Speed.
However, before doing that, an Engine Inspection should be done. Compression Test, Check for a good Spark(7/16" gap) on all Cylinders