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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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