You need a damn book…if you’re going to be buying and selling these motors you should invest in a parts and service manual…the paper kind not virtual online shit…a real honest to goodness book…with pages….it actually list mini bike specific motors and their parts…you’d be amazed…and a better mechanic…
Rebuilding an engine is much easier then working on a copier. I have completely rebuilt 5 big blocks and 7 small frames so still learning as I go along. Most engines I get look like the attached before and after pics. More rust the better, ha-ha. Finding these snow blower engines here on east coast are really rusted on outside but inside engine looks hardly used, most still have factory cross hatch marks on cyl walls.
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