Thanks Jack
Very interesting.
I doubt that mine is pre 1935 so I guess its an OMC Johnson Iron Horse. I thought OMC only made 2 strokes. I did once have an early 60's 3HP Johnson outboard. It ran very smoothly as well.
The generator ran beautifully before it got dunked and I did get it going again afterwards but I must not have gotten rid of all the water. They had electric start driven by reversing the current through the generator so it acted as a starter. Very good.
I notice in your links that they are only 5/8 HP. I would concur with that - not much power but enough to charge a battery if you were not in a hurry.
What is the Cooper connection? A made under licence deal or something for Australia. Like Kirby Lauson.
As I said before, I think that engine is too small for a mower except maybe a 10 inch cut or similar. There may have been bigger models of course.
All the best
Jeff
