I've read a number of articles and talked to people who buy these engines and resell them and it seems to all come to the same point of quality control, or the lack of it, all the people who sell them i the US tend to rip the engine apart, clean the sand out of the castings that was left behind at the foundry, replace all the bearings, re machine some of the more precise parts, then put it all back together, granted these tend to be pretty simple engines, but it's still alot of work and tends to double the price and is an investment in time, tools and figuring out what the specs should be.
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