Have you checked the compression, or is that what the seller is saying?
You can tell a lot just listening to it run.
If it idles well at low RPM, the compression is probably at an acceptable level.
A lazy puffing of vapor out the cc vent is normal, blowing, or one cylinder puffing excessively, blowing oil droplets, not good.
Blue exhaust smoke on acceleration or under load, not good.
History of fouling plugs not good.
If you can, pull the coil wire, crank the engine through, listen for freewheeling cylinders that don't load the starter.
And there are other things that can cause low compression, something as simple as a broken valve spring, valve out of adjustment. Or a top end problem, valve burned or seat come out, bent, blown head gasket.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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