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What about going up to 10 x15? It is still within the specs, (I think)

I ripped out the foam and replaced it... I had a lower pitch prop back then, (the original one a Mercury OEM) but I do not remember what pitch it was. I am sorry I am clueless about my RPM, but I think I want to install a RPM gauge. I mean it may also be the age of the engine I use it about...

Hello fellows, I am new here but not new to boating and fishing... I am replacing the prop on my 1983 16.5 foot Tracker with a Mariner 40 HP (Yamaha mfg.), it currently has a 10 3/8 x 14 pitch and I get 23.5 to 24 on a calm day WOT. A few years back it would easily do 27-29 and was not as...