Home › Forums › 250 Superkarts › piston mod on 250 engines?
This topic contains 2 replies, has 2 voices, and was last updated by nigel cooper 5 years, 6 months ago.
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
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.
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
ll be posting a question in the next few days regarding a comment you made a few years ago regarding cylinder cc
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