Originally Posted by Northern Tim
I've been told that a 25hp engine built prior to 1995 will only give me about 18-20hp at the propellor, whereas a modern engine will give me 25hp at the prop. Is this correct?
The HP ratings were changed earlier than that but you're correct-Mercury went over to prop-rated HP in around 1988 and sold their old style 50's as 45's. Not 100% sure when Evinrude/Johnson did but definitely before 1985.
Bear in mind that stated horsepower is only a guideline and can has to be within 10% of what is stated on the cowl so a 30 could be from 27-33hp. Essentially, do your research thoroughly...
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