purpose of the cut out in the side of 2 stroke piston

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6/17/2019 12:45 PM

just bought a new piston and it doesn't have the cut out like the other one does anyone the purpose of this what difference does it make


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6/17/2019 3:16 PM

Mixture and weight

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6/17/2019 3:34 PM

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6/18/2019 7:06 AM

cheers for the response not sure i follow what do you mean by mixture
i have emailed wiseco to see what they say but no response yet

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6/18/2019 2:25 PM

I could be completely wrong, thought I read it in A Graham Bell tuning book, were used in possibly kart engines, last year I did talk to a guy at wossener about lightening a 72mm piston, he said the pockets in there were pretty much at there limit before it compromises strength.

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6/20/2019 1:35 PM

so its only a weight thing then wonder why wiseco didn't bother with them i borrowed my friends scales so i could compare weight of wiseco and vertex i didn't think it was too bad considering its forged vs cast



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6/20/2019 1:36 PM

wiseco wrist pin is heavier also

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6/20/2019 8:26 PM

It's for extra crankcase compression. At least that's what the ads used to say. I wouldn't worry about it.

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