I took the belt cover off and drove it around so the problem would happen. It looks like either the variator or clutch is stopping the engine when I come to a stop. Then I tried to push the go kart while the belt was tightened from the stopping issue, and it looked like the clutch wasn't working properly. When I pushed it, the belt stayed in place and the outer piece of the clutch was moving in a jerking way, like something inside was keeping it from moving smoothly. I don't know if it is supposed to do this or not but if it is, I thing the variation may be too tight on the belt since it moves with the engine.
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