It sounds like you were gripping too tightly on the wheel and pulling yourself forward in the corners. You shouldn’t need to have your biceps flexed while you’re driving.
The seats typically don’t fit. Go Karts Race is all turns and no straightaways. I was initially baffled as to why my biceps would hurt. I met a guy there, unfortunately I forgot his name, who said he is a long time Kart racer and he said he comes to this track for the work out instead of the gym. I see why now.