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Merc outboard prop

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95 Mercury 125 two stroke on an Sportcraft 180 center console. I switched from a 13.25 x17p (36-38mph) three blade to a 13x17p 4 blade (32-34mph). Definitely get up quicker and lost a few mph as expected. Didn't get a chance to see max RPM. After some rocks and what not I switched back to a 13.25x19p 3 blade, now its a dog getting up and I didn't get any mphs back ( didn't want to go over 31pmh). 19 too much pitch? The 4 blade felt best and I was maxing out at about 34mph. That sound right or should I be getting more MPH with a 125 on an 18'? First boat bigger then 12' and 5hp. West marine didn't have what I wanted so an employee used the book and sold me a 14" 3 blade 17p but it was too big, end up the prop didn't fit into the gear housing so tightening castle nut would just press the prop and it wouldn't spin. 

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125 hp 1994-2005   4750-5250    WOT RPM    2.07

gear ratio

 

Those were the numbers I see on merc pages, forums and prop selector pages. This motor is one of the inline 4 "classics" that run on on 2 cyc low rpms. 

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