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Mayed, its called re-boring the cylinder, which is a common procedure all over the world... chiselled means to do it by hand using a chisel like this one



You need to first find out what Oversize pistons you are using and then buy the rings from a site like this one

http://www.cmsnl.com/honda-cbr250rr_model14664/

Once you have the part number, you could do a search and these guys may just have what you need
 
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