The tractor is now running. It is magneto ignition.
Thanks VERY much for all the responses.
I was especially interested in the "clearance" question because for years I've been thinking that with all that cylinder cavity, etc. that there was lots of cavity for the ignition phase. Then I remembered that I had a head ground on an 8N and was told that as long as the piston didn't bump the head, without gasket, then there would be adequate clearance with gasket. Thus just thousands of an inch space between top of cylinder and head when ignition occurs. Heavy carbon build-up would reduce space even further.
Yes, we cleaned carbon off piston heads, valves and the head.
Son and I are happy campers to have this old engine running nicely even if the engine is essentially worn out. Good oil pressure as well.
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