Cause for piston scoring help
 

Pretty new to all this so just wondering if anyone may know what caused this type of scoring on a used '04 EC 250 GAS GAS I picked up. Going to replace the piston but also wondering if the cylinder will likely need replating as a result of the 2 deep gouges that can be seen or is this from the exhaust port. Picture taken from exhaust side.

Link to the photos - https://photos.app.goo.gl/ubXDzKhHkGXxZhhH8

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Attachment 9350

Once zoom in geez that's odd. Like something has been through engine.

Probably bad air filter use.

Have to pull it down to see. Bore is a lot tougher than ally.

It is hard to say but I agree it is likely some debris that came from the intake. You will know as soon as you pull it apart.