Home Forums 250 Superkarts piston mod on 250 engines? Reply To: piston mod on 250 engines?


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