I´m really interested in testing one off this kawasaki 550 jet pumps! Also I will get alot more trust than now because mine only needs 55A to run at full trottle..
But my problem is where to get one? In germany I couldnt find one and shipping from the usa costs about 80$
I am afraid that you just have to accept the high shipping price. Ebay.com, pwctoday.com and x-h2o.com is some great sites to get a cheap pump. Ebay is maybe not the cheapest, but you got a bit of security with it.
I know there are a couple of guys that tried to make a stand up jet ski with electric motor, but without any success. High performance water jets require big power, one of the upsides is easy cooling of the motor, controller and that the controller have a very easy life.
Do you want to sink any money in to this project or is it a cheap try?
In any case, you will have to use an impeller with the right pitch according to motor power and your speed goal.
If you are lucky, there are some very good deals to do at some of the forums I linked to.
Good luck with your project, I really hope you make it