Burnt up the rings on my 2000 honda 650l motorcycle and am fixing it?

Burnt up the rings on my 2000 honda 650l motorcycle and am fixing it? - 1
Added (1). took the jug to be bored out and the mechanist said for me to get a piston 10 over or.25. What does this mean? The stock piston diameter is 99.96-99.99, should i get a 101mm piston kit?

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