The 81 should be vm24 with pumps, they didn't go to the CV carbs until 82. As far as I know there aren't any straight forward kits for the 81 carbs. Most of what you need is in the kit z1 sells for the earlier, non-pumper carbs, but you'll have to purchase bowl gaskets separately because the bowl gaskets in the kits aren't right for the pumper carbs. Also, if memory serves me correctly, the air screws are different in the 81 carbs and are not included in the earlier kits. If your jets, air screws and other brass parts aren't thrashed you might be better off purchasing the bowl gaskets and an O-Ring assortment, particularly if you are going to be rejetting for the pods anyway, because the kits aren't going to come with the right size jets for the pods.