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pro circuit hi comp piston

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hi guys just wondering if any one can help im planning a rebuild on my 12 crf 250r and have been running a pro circuit hi comp piston since nearly new its done very well and definately sharpened the motor up im wondering what comprression ratio they are as they dont quote a one and im thinking of perhaps trying another make but know that whatever ratio pc uses seems fine for me i run only premium pump gas over here in the uk any help would be appreciated thanks

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