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2005 yz 125 cylinder and piston size?

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hey everyone i have a 2005 yz 125 i just textured the intake ports and polished up the exuast port and chamferd the windows. i m replacecing the piston and its a wiesco pro lite 54mm but i want to be sure i get the most  i can.the head is also milled, not sure how much was like this when i bougt it. but i cant fine what size cylinder i have the numbers on the side are Y-2 ic300. and what is the best size piston for this cylinder? thanks in advance.

 

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