Where is the water intake on a yamaha waverunner?

I have a 1990 WRA650 and want to run it on the trailer for testing purposes. I need to know where the water intake is and how to hook up to it so I can run the engine. I bought it 2&1/2 years ago and never put it in the water. I need to run it to make sure it is even worth trying to get going again. I really know nothing about PWC's I am a dirt bike and ATV guy.