Hello ton66,A warm welcome to these forums.
I think I can supply some information.
I will also contact another member who is an outboard expert.
It won't be a Kirby outboard, but could be a Kirby engine.
But that leg does look familiar - in that it is of Australian origin.
If it is, it is very possible it will be a Kirby-made engine.
The Kirby engine was, essentially, a licensed Johnson Iron Horse 2-stroke.
I have discussed that here:-
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=59415#Post59415The issue is, who made the outboard itself.
We'll just have to wait and see if a member has more information.
[the leg has quite distinctive flutes]
Hope this helps.--------------------------------
JACK.
