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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Screenshot_20220706-131115.jpg