There are a few way to go about this and it all depends on how bad your cylinder is...
You might just get away with honing the bore if its just shiny in places. You need to measure the bore in a few different places to see how bad it is so don't go crazy just yet.
Yamaha sell piston rings for difference stages of overbore. Your dealer should be able to give you the specs for the rings.
What was the mileage ? Were you blowing oil before ???
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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