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(My father bought a new one like this in 1955; I rode to the factory with him at the airport in Orlando the day we picked it up. It was "pre-Disney" Florida and a different world than today..…..) I've had this boat for about 8 years. I rescued it from a "bubba" out of sentimental reasons...

Is this a 1956 Johnson 15? Otherwise, how would a person upgrade a "9.9-15 Family" motor to a 25hp motor? I'm sure I'm missing something here. Please forgive...….

I do not believe you are going to get 24mph at 2800 rpm with a 25hp 2-stroke motor. Look at the back of the tach and see if the setting needs to be changed.

Yes, they did. It was the first year of the 30hp. However, they also made the 35 - it was the last year for the 35 in the U.S. (except for military and the later 3-cyl, etc.).

By the difference in the shape of the transfer ports in the block. 30 and 35 have different blocks (machining)

I have a 1984 35 and a 1988 30. You can really feel the difference between the two; the 35 being stronger. When I change motors on the same hull I have to move the tilt pin because the 35 will porpoise whereas the 30 will not. Same pitch prop (13). Did some research in the parts manual...

The 9.9 to 15 is the only true swap with just the carburetor change. On the 25-30-35 there is a crankcase change, to wit: the 20, 25 and some 30's have "finger" ports on the chamber intake ports. 35's have "bridge" ports. True 35's will have maybe a little rougher idle and a rougher...

1984 was the last year of split gear case on 20-25.