06 gti rebuild is overheating

[quickstrike]

So I got the o6 gti put back together took it out for a spin and now I've got more problems.
Ski started fine in water and drove good but after 3-5 min I got a steady beep I thought it may be that I had no gauge cluster. But then the ski went to limp mode so I idled back to the dock and it was def overheating. The oil level was perfect before and I topped off the coolant with green freeze. I have one threaded hole by the impeller I think that's for flushing ?
Then two drain plugs but I also have two plugs on port stbd side aft there a rubber tube thing inside should I take these plugs out when I'm in the water??

 

[ski-d00]

Was the exhaust overheating or the engine?

Not sure what you are referring to with a rubber tube thing inside. Can you take a pic?

 

[AircraftDoc]

Need to find out what model you have. There are numbers under the seat. Type them up, here. We can narrow down what is going on easier. Give us all the numbers and some pic of the engine compartment and jet pump area.

 

[quickstrike]

Here is a pic of the only numbers on the seadoo.

 

[AircraftDoc]

Here is a pic of the only numbers on the seadoo.
View attachment 25740

Ok, it's a 1503 engine. 130hp. 155hp need pics of the engine compartment.

 

[quickstrike]

Okay here are some pics of the engine area.

 

[ski-d00]

I'm still trying to figure out what the two tube things are in your original post. Can you post a pic and we'll tell you what they are. They may be air vent lines but there are nothing that should be removed when you are on the water.

Again, do you think the exhaust is overheating or the engine. It will be obvious, feel the water box and it will be smoking hot if it is overheating when normally it is only warm. The engine over heat is also obvious.

You need to run it on the hose for a maximum of 4-5 minutes to check the exhaust cooling system(the threaded hole by the pump you refer to; engine on, water on, water off, engine off). I'm going to guess that your j-pipe needs to be removed to have the 3 small holes cleared in the end of the pipe. This is a common exhaust cooling issue.

You really haven't given us enough info to properly diagnose your problem.

 

[AircraftDoc]

Ok, you have a inner cooler and fuel injection. You should have two hoses fwd of the engine.
You inner-cooler could be clogged. Pull the hoses and back flush. Those are also replaceable.
Flow route.
External water from jet pump to fwd engine to inner cooler back thur exhaust manifold and out the back.
You need to download a shop manual. It would show all of this. You might find one online or become a premium member for $10.95 a month and get any manual you want.
The treaded hole in the back 3/4 hose female is for flushing after riding. Manual will show. Engine on first, then water. Water off, then engine. Only for a minute..
The starBD and port plug (outboard of the jet) is for draining water out of the hull.
.. The rubber tube thing... I think you are talking about your exhaust. Again shop manual will help here.

 

[quickstrike]

The exhaust is fine it's the engine over heating. Checked the pump and hoses they seem fine. The thermostat is brand new it may be the culprit. The holes on the side with the rubber was part of the opus system. I orderd the proper delete kit.

 

[quickstrike]

I flushed every line with the water pump off. And bumped the starter to make sure the impeller was spinning.
The only clogs were in the seadoo jet vertical thing and the pisser up forward.
I thought the ride plate might be clogged but there was good flow through it as well.

 

[ski-d00]

Cooling system is pretty straight forward. If all passages are clear and the pump is moving coolant. Remove/replace thermostat and test.

https://www.youtube.com/watch?v=_zXwRdD1zxM

 

[AircraftDoc]

Off brand thermostats fail quite a bit in auto parts. ... But... When thermostat and water pump are good, look to your head gasket.
Do a compression test. Just a little leak will make the coolant blow out, boil and overheat the engine.

 

[quickstrike]

So I pulled the pump off again. And the thermostat piston was broken. Since I live in the Middle East and it like 90 f at 4 am. I'm going to try and run it with out the thermostat I used to do the same with my outboards in South America because they would restrict flow. I'm not sure if this will affect flow / direction.
I'll test in the morning and post results.

 

[quickstrike]

So I went for a ride this morning and it was great.
Just about 20 min no issues so I'll keep pushing and see if there are any issues.
I can't wait till it's reliable and Ill start to pull the tube around.

 

[AircraftDoc]

That is great news.
The engine will need a thermostat so the engine can stabilize at 200° F. Burns off moisture and kills stuff out of the oil.. The computer is set to optimize the engine at temp.