There is a scale for weighing karts at the local track, a steel plate built into the floor, level with the floor.
We were running 61/39 (R/F) first time I checked, and 51/49 side to side.
As you suggested, at yesterday's practise we weighed the kart again with the driver moving around. At the extremes, i.e. leaning over so far he would not be able to drive the kart, he moved a total of 3.4 KG from one side to the other (2 KG more on one side and 1.4 off the other side).
Leaning back so far with his head that he couldn't drive, he moved a total of 2.6 KG backwards.
The most interesting part was when he leaned forward like some pilots actually do, and moved 4.5 KG from the rear to the front. In terms of driving position, this was the only useful result - showing that leaning forward will have quite an impact on increasing the load on the front tires while decreasing the load on the rears. We also learned that he can change the side to side weigth distribution while driving, but by perhaps no more than 2 KG. Another weighing session is in order with realistic driving positions to get more accurate results.
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