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Big bore kits

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I have my 06 yz250f for about 8 years. When I bought it I was told it had a big bore kit and the stock cylinder was included in the box of parts. I was cleaning the bike and noticed that the cylinder says 249cc and looks just like the stock cylinder...  

Is there a kit that looks stock to be sneaky and is there a way to tell? Getting ready to sell it and want to be honest with any buyers.

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They may have bored the stock cylinder. You would have to measure bore and stroke to find what displacement it is.

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I had to go look but my 270 cylinder says "249" on the side.  ?

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