After taking out the top, check the piston for movement sideways. it should be tight. If it's not change the piston. Also check the piston ring groove while the ring is in its groove. Insert a feeler gauge between the ring and the top or bottom of the groove and if it measures between .001" to .003' it is still good.
Try to feel the top of the cylinder for a ridge. If there is an obvious ridge, it must be re-bored oversize.
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