You are correct in thinking the kart on the stand doesn't have the same load on the engine as actually on the road. That's when the engine will require more fuel (under load)
Here's what I suggest doing. Take another spark plug with you. Make your kart stall out on you. Install the other plug and look at the color of the one that was in it when it stalled. Let's see if that will indicate a fuel delivery problem.
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