Piston ring sizes
  • Sam400
    Posts: 12
    Joined: Sun Jul 19, 2020 2:30 am

    Piston ring sizes

    by Sam400 » Wed Jul 29, 2020 12:34 am

    Hi does anyone have the oem piston ring thickness for an 08?
    Just trying to sort a piston/ ring mismatch and the info would be helpful.


  • User avatar
    Posts: 3789
    Joined: Sat Nov 25, 2006 6:31 pm

    Re: Piston ring sizes

    by JimDirt » Fri Jul 31, 2020 1:51 pm

    Hopefully this helps ...

    02 CRF450R
    06 CRF450X
    Weiser , Idaho
  • Aussiecrf230
    Posts: 1724
    Joined: Fri Jan 06, 2006 11:11 pm

    Re: Piston ring sizes

    by Aussiecrf230 » Sat Aug 01, 2020 6:32 pm

    Hi Sam,
    Well I have seen written down that Honda has changed rings thickness several times.
    Rings have tended to get thinner to maintain a seal as power has increased.
    The 2006-2007 rings are 0.72mm
    The 2008-2009 rings are 0.85mm

    Are you using a factory or aftermarket piston.
    If you are using and aftermarket that has been around a while they may have stayed with the thinner ring.

    If you are using aftermarket piston then contact the maker.
    They probably based their piston on a particular year and should be able to tell you what oem rings fit.

    CRF230F 2004
    C30F Power Up needle
    Mains 132
    Idle 45
    2 turns out
    Baffle out, Screens In

    It starts,it runs,it gets to where all CRFs can get to without the valve or valve plate dramas

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