Home Forums 250 Superkarts piston mod on 250 engines?

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    • #5113
      nigel cooper

      An online cr125 rebuild manual mentions drilling 2 holes on the piston to assist in lubrication and reduction in wear.


      Does anyone do this on the 250`s  just wondering

    • #5134
      Ian Harrison

      Hi Nigel

      We don’t notice any difference with the holes drilled or not. The idea is that you get some extra cool mixture lubricating the port bridge.

      In my view your just as likely to get pulse-returned hot contaninated exhaust gas passing the other way when the piston is on the upstroke and crankcase pressure is negative.

      Best Regards


    • #5152
      nigel cooper

      Thanks Ian for the reply, (and the explanation)


      ps-Ill be posting a question in the  next few days regarding a comment you made a few years ago regarding cylinder ccs


      cheers nc


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