how can you tell if a cylinder on a dirt bike is sleeved or not?

elvin c

New member
I have a 1987 kx 250 I am restoring how can I tell if it is sleeved or plated? it is standard bore size (67.4) & if it shows that it is not sleeved which would be better boring & re-plating, or sleeving & boring?
 
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