A "roughed up" looking piston doesn't always mean a shagged barrel. Of course, you want to give it a bloody good check over, but there is a possibility that a used piston has been cleaned up enough and fitted to get the motor running to shift the bike (out of Japan).

The Honda plating is actually bloody good, and very resilient. It can often withstand a seizure when you would normally expect it to be trashed, unlike after-market plating that I have even seen peel away from a bore! What isn't so good however, is any damage around the top of the barrel caused by detonation.
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Andy.
NSR-WORLD.COM

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