Five years to start, probably another five to complete...

[Track T 2411]

Too bad it isn't a 1000, where you could pull the cover and pickup screen to possibly gain access on the back side. If you try epoxy, roll it on its back for the work but don't force so much in that it gets in the lubrication system. That '80 motor doesn't look bad. A few hours on it after a week or so soak with penetratrant should free it up.

The 1100's do have the access cover just like the 1000's...

[UltraRunner]

I'm going to try the JB Weld route, and see how it goes.

I will simultaneously try to un-stick the 1980 engine.

I'll make an actual decision about which one to use at a later date...

[Fred Camper]

It has to be repaired even if you do not use it now. Cannot have a spare engine with a leak you know. Seems like a reasonable repair. My Dad stripped the spark plug on his Jacobson aluminum lawnmower 40 years back. It was new. He glued the plug in with expoxy. Used the mower for 20 years, occasionally removing the head to clean and gap the spark plug. It never leaked or got loose. Mowers were pretty low compression back then.

[CYBORG]

now thats a creative fix

[rcmatt007]

that is one way to gap a plug