Hello from Finland. I'm a new sea doo owner and having cooling problems with my 1999 GTX jet. It heated up and melted two pipes. One is what goes from exchaust to watertank valve and another is what is between exchaust and water tank. I found a bright hose in back of the jet whitch was full of dirt. This hose goes to T terminal witch goes to exchaust. What is this hoses purpose?
I assumed that it causes the heating problem.
What the water tank valve controls? It looks like RAVE valve.
Thanks Ari
I have a 1998 xpl with a 951 and my manual shows the cooling system routing to be the same as a 1998 GTX. Its probably the same for a 1999, but if it isn't exactly the same, its close. There is a black hose approx 1/2" ID from the jet pump to the bottom of the exhaust head pipe where water comes in to the engine. There is a black hose approx 1/2" ID from the cylinder head to the pump bracket on the transom where water goes out. There is also a clear hose that attaches to the engine case near the bottom on the right(starboard) side, and that also goes to the pump bracket on the transom. Water goes out that hose. That hose also filled with sand on my XPL. It was packed in so much that it wouldn't flush out. I had to remove the hose and bang it on a telephone pole to get the sand out. There are also smaller black hoses that go from your exhaust pipe to the water regulator on your exhaust water box.
You'll have to check them all to make sure they are all flowing. You may also have a rock or debris caught in the jet pump itself where the take off is for the cooling hose.
While back-flushing the ski on the garden hose with engine on, observe the back of the ski. Check to see that water is coming out of the jet pump where the take off for the cooling hose is, the engine case drain hole in the pump bracket where the clear hose attaches, and out of the exhaust itself. And, see if water is coming out of the pisser on the side of the ski.
You could have sand in the engine too, but check the hoses first.
Edit: The water regulator (RAVE looking thing) regulates the flow of water into your exhaust pipe and muffler depending on speed.
Edit: I just checked the diagram for a 1999, and it is routed differently but still similar.
