What would cause this piston damage.. twice.

* wormdirt * /
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I've had this happen to 2 treats 50cc top ends on the same ZA50, one after the other. The damage is identical, if I didn't toss the first damaged top end I would show pics. So wierd. I blew the crank out with air in case something got all up in that shizz.

Where do I go from here?

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