I've seen a lot of bikes with over 100k miles on them and still going strong. My buddy had a 78 kawasaki with 215k miles on it before it needed a rebuild. It was air cooled, which probably shortened its life a little...there's no telling how long these will last being fuel injected and water cooled. Manufacturing has gotten so much better for engines in the last 10 years that I would expect the rest of the bike will start failing before the engine if taken care of right.
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