Also Sprach Kevin :
Greetings!

I have just aquired a 25 hp Johnson which I suspect is from the late 70s or
early 80s. I have been unable to pin it down using any of the resources on
the web.
I think perhaps because it is not a consumer model but
commercial/government?

Model: J25RCIM (or is it "one" M)

You have a 1981 25 HP Johnson, regular consumer model.

J for Johnson
25 for 25 HP
R for Rope Start
C is code for "8"
I is code for "1" - I N T R O D U C E S = 1 2 3 4 5 6 7 8 9 0
M is the factory lot number.

Dan


--
Welcome President Bush, Mrs. Bush, and my fellow astronauts.

-- Dan Quayle