Last weekend away I found this sitting out the front of a museum. IT is still there as I have no need for it but it took me a while to realise what make it was.
I found a picture of it in the window out front and they identified it.
It is odd that it breathes from the crankcase or bum like a frog and is possibly why these engines rarely run consistently or at all.
My last comment will create some feed back!