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Thread: 250R bore size

  1. 04-09-2007, 10:25 AM #1
    crazyhorse98
    crazyhorse98 is offline Registered User New to the board
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    Apr 2005
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    Bradgate, IA
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    250R bore size

    Hello Guys,

    I recently tore apart my '82 250R to find out that the piston was missing some pieces and made a grove in the cylinder wall. So i bought a new .040 over piston for it but would anybody know the clearance for that? I don't have a book for this and figured someone would know this information.

    Thanks Matt
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  2. 04-09-2007, 10:36 AM #2
    Fuzzy8766
    Fuzzy8766 is offline First Time Rider Arm chair racerNew to the board
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    Feb 2007
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    96
    If I remember right what you need to do is bore the cylinder at .002 to .003 over what the size of the piston is.
    Last edited by Fuzzy8766; 04-09-2007 at 05:41 PM. Reason: wrong numbers
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