1992 Mercury 115hp Outboard.

[Jasper302]

Can I run a 13 3/4 x 21pitch on my outboard? I already have a 21 pitch prop on it and its a perfect match, but I think its like a 12 something x 21pitch.

Thanks,
Dennis

[ESOX]

If the 12x21 is a perfect match the 13 3/4 x 21 would be way too much prop.

[Damark Marine]

Can I run a 13 3/4 x 21pitch on my outboard? I already have a 21 pitch prop on it and its a perfect match, but I think its like a 12 something x 21pitch.

Thanks,
Dennis


Its hard to say with props. If it fits you can try to run it & see if your boat likes it. You might be able to turn it. The only way to know for sure would be to run it & make sure at wot that you are still in your engines rpm rating, preferably the upper portion of it.

Why are you looking to change if what you have is perfect?

[javelin]

Depends on the boat. For instance with an Evinrude 250H.O. - I will put a 25-27 pitch on a bass boat, but for the same motor a 22 pitch on a Ranger 620. Depends on the load you are pushing. Lighter load you can go bigger prop.

Like Damark said, MAKE SURE you are at the top end of your RPM curve for that motor. Most likely 5,500 - 5,800 RPM. Two strokes like to be run hard at higher RPM's, keep this in mind!

[Jasper302]

.

Why are you looking to change if what you have is perfect?

The one I have is the one that came with the boat from new, and it has some wear on it and I'm sure its not very true. I'm thinking that stainless would be a nice upgrade.

[Jasper302]

Depends on the boat. For instance with an Evinrude 250H.O. - I will put a 25-27 pitch on a bass boat, but for the same motor a 22 pitch on a Ranger 620. Depends on the load you are pushing. Lighter load you can go bigger prop.

Like Damark said, MAKE SURE you are at the top end of your RPM curve for that motor. Most likely 5,500 - 5,800 RPM. Two strokes like to be run hard at higher RPM's, keep this in mind!

I think the owners manual say 5,200 top range and I can run it right on it.

[javelin]

Typically when you go from aluminum to a stainless prop you drop down a size in pitch to maintain the same RPM's.

[mi duckdown]

Take your prop and have it reconditioned.
The problem with changing prop pitches and such is the most shops won't let you bring the prop back if it is not to your lliking.
you must keep the rpms in the sweet spot. over rev is as bad as under rev.

[WoodTick007]

Call Johnny's Propeller and Radiator in Detroit and see if he has a used recon prop.... They are great! http://johnnyspropeller.com/

[UNCLE AL]

I run a stainless High Five prop on my 115 on a 18ft smoker craft, and when you hammer it from a stop this boat nearly jumps out of the water and gets on plane. I like it.