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If there is no scoring or other damage to the cylinder, you may not need to bore it.

Well, that's a 65u engine which is pretty reliable. For most of the older 2-stroke machines 200-250 hours and they're ready for a top end. You will need to bore the cylinders and go with new oversize...

Yes! That is a known issue and common failure mode. Perform the balanced return mod to keep that from happening.