CM 250 clone refers to engine and not on the entire motorcycle. No, I do not believe that this engine is made in "Jawa" factory, but also I do not think that this twin engine is "Lifan"'s exclusive product. You can find at least half a dozen Chinese factories which produce such engine.
Who said that he pass?
I do not believe that adding oil mixer, contactless ignition, perhaps better carburetor, done enough for "Jawa" to slip through EU emission regulations, but, damn, this thing lap up
at least 4l/100km. Too much by today's standards.
BTW, four or five years ago, I read in one of the Russian motorcycle magazines, that there this two stroke costs about 2700 euros. Can you imagine a C-moto that costs so much and how much better than this "Jawa"?