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Old 07-05-2022, 10:17 PM
Frenchy13 Frenchy13 is offline
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Default 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

Screenshot_20220706-131057.jpg

Screenshot_20220706-131115.jpg


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Old 07-06-2022, 03:45 AM
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(F5) (F5) is offline
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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.
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Old 07-06-2022, 07:52 PM
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Zman Zman is offline
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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.
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