Re: puch polini 4 petal porting ??

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On closer look of your pic It looks like port timing wasn't changed that much but the flow approach to the ports is. The original profile was there to aim the primary charge up towards the top of the cylinder to help keep the new charge seperated from the combusted gasses leaving the cylinder. If you want to get wild you could regrind some of that original transfer look by raising the actual intake/transfer ports

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