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Again what is GN?
And what is your exhaust header specs???
You lobe separation angle is very close and the 28 venturi size makes the carb think they are running wide open, (an 80cc gokart uses a 28mm carb)
each carb needs to be bigger, not smaller and once again---that manifold is for very hi RPM ---meaning---runner length tune rpm---any thing lower than optimin suffers
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