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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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