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Odd formation on bottom of cylinder sleeve


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So I pulled off my cylinder on this 91 yz80 and on the bottom of the sleeve there is this weird thing there. Is it normal or is it worn out? I'll let the picture do the talking. It looks sorta like the shape of the bottom of the piston.ImageUploadedByThumper Talk1417404724.736847.jpg

The lighter part is what I'm talking about, and it's raised up about a half a millimeter I think.

Thanks

Edited by M3NT4L5
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Looks just like the taper on the bottom of the barrel, can't see anything wrong there. Where is the worm out bit, I cant see the plating at all. I'd expect most wear just above exhaust port and main intake port which is not in picture.

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Looks just like the taper on the bottom of the barrel, can't see anything wrong there. Where is the worm out bit, I cant see the plating at all. I'd expect most wear just above exhaust port and main intake port which is not in picture.

This is a sleeved cylinder not plated Edited by M3NT4L5
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