In my opinion you need 2 drivens.The one one the black kart has something seriously wrong with it-the warped pulley is because something is damaged at the shaft.The clutch on the black one is missing the brass bushing,you need to take the bell cover off and see if the internals are still good (springs,pins,surface on the inside of bell cover needs to be smooth.You got your money's worth but your stuck with the corrective work from little to no maintenance on the CVT system.Since these are single seaters you could change over to a standard friction clutch straight to the axle sprocket,not sure how fast they'd be, but do-able.
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