Also, that thread that Bills86e sent you has some great info, but keep in mind, not all Mikuni carbs are exactly the same. There are several different versions used in seadoos. That thread also shows a dual carb setup, and if I am not mistaken, you have a single carb.
Some carbs, the inlet and outlet ports come out and bend at a right angle, others, the ports come straight out, while others have them on opposite sides of the carb.