From:Mutt e-mail:pigstye13-A-aol.com
Subject:RE: 125 & .020 over Date:Thu Jul 16 09:12:54 2015
Response to:20640
Depends on what the extreme bottom of the piston measures.
New repro pistons usually measure 2.0805, the bore size
recommended by them would be 2.082 , but that's rather tight
I would commend 2.0815" -2.0825 giving ya .0025- .0035"
clearence

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Can someone tell me how much I need to open up a 125cc
cylinder so it will accept a piston/rings that are .020 over?

Thanks
Rusty