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Thread: 250r overbore?

  1. #1
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    250r overbore?

    Decided to try and rebuild my 83 250r. just wondering how far i can safely overbore it? thanks for the help

  2. #2
    bigred44's Avatar
    bigred44 is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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  3. #3
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    It really depends on how much it has been bored in the past? If the cylinder is on it's original bore you have room for several more, unless the bore is scarred or grooved really bad. If the cylinder is on it's last bore, you will need to sleeve it.
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    1982 ATC70 (Lifan manual 125)
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  4. #4
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    Its .010 over at the moment.

  5. #5
    nitrodude81r is offline Check My Feedback before dealing with me Arm chair racerNew to the board
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    You can bore it out to .080. But if you are only at .010. IMO go to .020 or .030 depending on how the cylinder looks.
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