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The vacuum lines come from both carbs and meet in a T fitting. From there, it becomes one line and this is the one that goes into the friction fit hose holder on the right ear. As mentioned earlier, it the air intake into the hose is restricted, the engine will not run right. I wouldn't worry too much if the hose was tucked up under the tank as the ear supplies no filtered air to the hose, it merely acts as a holder to keep it out of the way and open. As long as it is sucking air, it's good to go. If you are one of those who has to have the hoses run to their proper place, no prob, just run it to the right ear and put it in its place. Again, follow the advice here and cut the end off at a 45 degree angle so that the end of the hose can't be restricted by the back wall of the ear.
Hope this long explaination helps. If you really want to see how the hoses connect to the carbs, go to Kawasaki's websight and under Owner Information select parts diagrams and pull up the carb micro fiche. There you can see how it all fits together.