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I just got a 1971 25hp Johnson and was told that it could be made into a 35hp by changing the carb to a carb off a 35hp. Is this true or do they have a different bore & or stroke...?
Re: What all is different in a 1971 25hp and a 35hp Johnson?
No way, no hown. The '71 25 is a maxed out 22-cube block. The old generation 35s are 40-cube "Big Twin" style motors, while the later style 35s are 31.5 cubers. VERY different motors. Your 25 is a 25 and that's all it can be...
Re: What all is different in a 1971 25hp and a 35hp Johnson?
And, anticipating your next question, there is no easy way to convert your 20 to a 25 without major surgery (different crankshaft, cylinder head, etc.).
