The kit works fine in a 72 but keep in mind there were differences in jetting between 72 and 73. That kit comes with 110/40 jets and Ive gone to 115/40 in my K2 as it was running too lean on the 110s. But its a good place to start and all components will fit -keep in mind that aftermarket carb kits are not always as good quality as Honda....saying that Ive never had a problem.
Good luck
Andy