I agree-a non-functioning kart isn't any fun! First thing to discuss- The inserts are to protect/dampen the ramps on the driven unit when shifting up or down. Being worn isn't causing your issues but being caused by the jerky action. On the link I sent you there is a section for finding the right belt, the teeth in the belt has nothing to do with it ability to work since the belt is worked on the sides against the pulleys only.
How much slack is there on the belt when idling? Next thing to check-you should be able to turn the outer pulley on the driven by hand to see if it's functioning properly, when you turn it the pulley halves should expand easily with just resistance from the spring.There isn't much to the driven as far as moving parts! Having the shaft lubed so the outer pulley can slide easily is all the maintenance needed. Can you post a pic of the engine area and clutch system- Alignment of the engine and CVT may be off causing the the problem- proper alignment is when the pulley halfs engine side are aligned.
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