Can a 2003 Kawasaki 900 STX jet ski pull a tube?

Yes. With two people it can go almost 50 mph. The person on the tube needs to be under about 200lbs and you need an observer for safety. I pulled a 13year old boy on a single ski with a 17 year old as an observer which takes a lot of power to pull a single ski out of the water. (I weigh about 180lbs.)