Re: 1969 Johnson 25 hp 25R69D

[Buccaneer]

I looked at the seven dollar outboard a little more today,
and notice on the power head the dark green Johnson paint
peeling off, and pretty blue paint underneath……… then
I notice the core plug in the block that says…….
Evinrude15035.
Internet search shows that my 1969 Johnson 25 hp has
a 1961 Evinrude 18 hp power head in it.

Questions….
Is this possible, or was someone being funny and put an older core
plug in it?
My repair manual only goes back to 1969, and it shows that
the 1969 thru 1972 18 hp, 25 hp Evinrudes, and the 20 hp and 25
hp Johnsons all had the same bore and stroke.

Q. It appears from the manual that the difference in HP in these
motors come from the rpm’s they’re running at.
The carburetor on this unit looks just like the one that’s suppose
to be on the 1969 25 hp Johnson, and perhaps is.

Q. If I get this motor running, how do I know if it’s going to be an
18 hp or 25 hp?

I notice that the 1961 18 hp Evinrudes and 1969 Johnson 25 hp
have different part numbers for the pistons, but I’m not sure
if the bore and stroke are the same?

Thanks for any enlightenment!

Prepare to be boarded!