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90 XR200 piston damage

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I am doing a top end rebuild on a friends 200 and saw some unusual damage in the cylinder when I took it apart. 

It looks like the piston and head gasket were making contact.  Anybody ever see anything like this before?  Wrong head gasket?  Head over decked?

The piston part number shows it as a model correct Wiseco piston.

piston1.jpg

piston2.jpg

piston3.jpg

piston4.jpg

What do ya'll think?

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I wonder if it was put together using an XL 

or ATC 185 head gasket. They are 63mm in the bore. That might explain the whacking. If you sit the head gasket back on does it overhang the bore?

 

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Just getting back to this bike.  Had a weather delay--named michael.  What PITA!

 

Anyway, it had to be the wrong head gasket, it is not close to the right size.  I was thinking maybe it was a missing dowel or something letting the gasket slip to far to one side and making contact, but any way it sits is too small.

 

At least it will be right when it goes back together.

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