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Hows this piston look?

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01 CR250R, stock piston, stock cylinder, best guess is the bike has around 20 hrs. Not much in the way of blow by but those black areas on the lower piston concern me. When you feel them they feel smooth, just looks discolored. Cross hatch on the cylinder wall is excellent. 

20140506_205915.jpg20140506_205839.jpg

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