Bob, I think you're spot on there, the Techumseh haad been mounted very uniquly into a hole that was to large for it, by clamping on to the inner edge.
Kori, I have two of these engines, one came with a slider ontop of the carby that let's you choose light or normal speed, the other one does not.
What can you make of that?
Also, do you know where one could find service data on these, I have one running, but it needs a bit of a clean up, and tune...