I see now that I didn't really do a follow-up on this one. Without much effort I actually got the original motor running fine and put it back on - the choke linkage was messed up. Of my three running Jacobsons, this is the only one that is pretty much totally stock. I just run it as a side-shooter.Next up is a model T-20, manufactured in the late 80's I believe, well after Textron's acquisition of Jacobsen in 1975. Still sporting the Jacobsen orange colors and lightweight alloy shell, but Jacobsen is now just a brand of the Homelite Textron company. I got this one for $15 as a non-runner with one broken spring adjuster. The adjuster was easily replaced, the engine I'm still trying to figure out. In the mean time I tossed an old B&S 3.5 on it and just made it a side-shooter rather than mulcher which requires more power.
4th pic shows the original motor, currently removed.