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Is that the Johnson of Outboard motor fame?
Hi Jeff
That's a great story you tell!

Yes, I think the early Ironhorse 4-strokes were probably from the Johnson Bros Motor Co.
Although, OMC clearly developed the designs after their 1935 takeover.

https://en.wikipedia.org/wiki/Johnson_Outboards
https://en.wikipedia.org/wiki/Outboard_Marine_Corporation

I guess they are an early example of the 'slant' single cylinder engines
that are now so popular - and ubiquitous.

I wish I knew more!

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Jack