Am I propped wrong??
 

Here is my set up, 88 Baja 240 sport, 454 mag, bravo one out drive, 4 blade 23 pitch. I'm not sure of the gears in the drive but I know everything is stock. I am only able to get to about 4100 rpm at wot, which only gets me to about 54 mph, I know the boat is capable of more, especially since I have the mag motor, I am able to rev to 4600 rpm in neutral. Should I be looking for something else or do I just have the wrong prop??

Try a 23 three blade prop.

Yes, you are over-propped. Years ago I had a Baja 240 with a 502Mag. The 23P 3-blade Mirage was the best for that set-up. With the 454Mag you may be more in the range of a 21P. That engine should WOT closer to 4800, however, it's best NOT to do it in neutral. :eek:

Yup, I would guess 21 Mirage Plus, I happen to have one for sale if he needs it:drink:

Im guessing a 21P Mirage Plus too. Your operating range is 4600 to 5000 RPM with a mag motor. You will probably gain about 600 RPM with the 21P which should put you around 4700 and in your powerband.

--Right now your damaging your engine by running it at such a low RPM vs what it was designed to perform at. I would change props as soon as possible.

What brand, what condition, and how much?

And thanks for your alls input, everyone here has always been very helpful!

You have a PM:drink:

I just sold this same boat this year (1997) with the 454 non-mag and found the 3 blade 23P Mirage plus put me right where I needed to be. Was going to send it out to be labbed but sold it to buy another boat.

So the mag motor should push a 3 blade 23P just fine.

A friend is lending me a mercury marine ss 21p. I have never changed out a prop, is it difficult to do?

A agree a 21 should put your rpms in the right area. But shouldn't this boat pull a 23 M+???