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I found the difference. The 25 HP is 3 cylinders! Bore and stroke about the same. Hence the extra HP. I'm going to leave the 20HP alone.

DaleH thanks for that tip. I’ll start there.

Hi there. I see that this question has been viewed 38 times. Is this not the place to ask a Motor question. Please advise if I should post it somewhere else. Thanks, John

Hi there, I did some searching. I have a 2014 2014 Mercury 4 stroke 20hp and want to increase the power to 25hp upgrade. I see that this has been done to earlier motors. However, I cannot find information on if a carburetor swap from a 25 HP Mercury 4 stroke of a similar year with some...