I can't qua tify the answers without LOTS of data but, I suspect, most of us would agree that if you raise the seat (and thus the driver's mass) by as little as 1 centimetre, the driver WILL be able to feel a significant difference in the handling. Try raising the seat in the wet and see the effect. You really don't need to move a seat much to feel the effect of the movement. The flat bottomed seat let's the driver's mass get lower, too.
That's the basis of my suspicion that it's NOT the different seat stiffnesses that the drivers feel when they change from seat X to Y: it's the small differences in CofG by having the two seats mounted even FRACTIONALLY differently.
However, I don't claim to be able to PROVE it!
Out of interest, if it's NOT there to lower the CofG, what IS it that the flat bottom does for the kart?
Ian
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