Mystery 70cc puch kit

b to the eff /
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I recently picked up a 77 maxi s with this "70cc kit" on it. Apparently it needs new rings and maybe a new piston. But first I have to identify it. I took a quick look at the wiki article and didn't see anything that it clearly was. Any guesses?

IMG_20200521_1649551.jpg

Intake and top of cylinder

IMG_20200521_1650031.jpg

Exhaust

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