Most likely you still have the stock bore since the cyclinders are nickle plated or haed chromed as they call it so boring it is not a good idea. The thinking is the hard bore doesnt wear the piston does so getting a spare would be a good idea if you intend to own the bike long. Make sure it comes with rings and wristpin and bearing.
A piston set with all the parts uasually runs about 100.00 bucks.
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