prop size

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Robert Spradley

Well-Known Member
May 28, 2001
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Anyone know what size diameter and pitch I need. I recently purchased a 1996 Mercury 125hp with no prop. My boat is a 1995 170TF. I not sure what the wot rpm should be because I have not purchased the engine manual yet. Please help.
I would have to say about a 23P. I turn a 18p or 19 depending on which prop I put on with my 90HP Johnson. And the guys that I have talked to that have 115hps are turning 21p. see if you can try out a couple props before you buy. But I think you will be in the ballpark with a 23P