I had a K241 that I had the dealer "rebuild" because it was smoking. This was 5 years ago, before I had the confidence to do it myself. Anyway, they said the cylinder didn't need boring, and they replaced the rings. Cost was $800. It lasted less than a year cutting 1 acre every two weeks. So probably 25 hours. Started smoking, piston slapping badly, and blowing oil out the breather cover. Took it back to the dealer and they did it over again, no cost. After that, I rebuilt them myself, and had the local NAPA machine shop do the machining. I think I've done 4 or 5 myself since then.
Anyway, you've got it this far apart, might as well bore it and do it right.
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