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Likely will be too much pitch causing motor to lug with full load (guys, beer, etc.). 10 X 13 is the "go to" prop in most 25hp & 14' applications. Only way to know for sure is to hook a shop tachometer to motor and go for test ride with 15 pitch and loaded boat. See if you get 5000 or more rpm at wide open throttle. Be careful; reading a tach while operating boat is a distraction. Also, flywheel will be exposed with cowling off motor. Very dangerous.
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