I’d love to try a SmartCarb on a KZ as well, but since it isn’t legal it would be a moot point.
baseline on those , coz i got plenty of time with that carb on my bench because my old engine was en ex rok senior . is somewhat on the safe and rich side . i had to play some with the jet needle and the float height to get it on the sweet spot . but they are good carbs and with cheap parts also to work !