Sea Doo '97 GTX High Speed Problems

[natecollins1]

Hi,

I am working on a 1997 SeaDoo GTX with a 787 motor. A friend of mine ran it with the hull plugs in and then left it for a day or so. The motor was partially submerged. I cleared the cylinders of water. I also checked the gas and oil reservoirs and they did not appear to have water in them. I am able to get the motor to run 7000 RPM out of water, but can only get it to run about 3500 RPM in water. The compression on the cylinders is 145 and 155. Please help me trouble shoot why this Sea Doo will not run faster in the water.

Thanks,
Nate

 

[Jeff Walkowiak]

Re: Sea Doo '97 GTX High Speed Problems

did you check the little coil box next to the battery for water inside, and the front electrical box under bucket?

 

[Jeff Walkowiak]

Re: Sea Doo '97 GTX High Speed Problems

if you didn't remove the pulse tube when you cleared the water out of the engine you may have forced water in to the back of the fuel pump and it isn't doing the job correctly and you may have water in the carbs ,, use some low air preasure and remove the pulse tube from the fuel pump blow air in the hole for the pulse and see if water comes out just use about 5 lbs of air. then remove the fuel line from the pump and the return fuel line from the back carb blow air through the carbs that way with the same preasure .

 

[Jeff Walkowiak]

Re: Sea Doo '97 GTX High Speed Problems

you may have stripped the threads on the rave bellows but that usually holds the rpm's around 5000 if the raves don't open

 

[natecollins1]

Re: Sea Doo '97 GTX High Speed Problems

I checked the fuel pulse line and fuel pump. They seem to be clear. I noticed when running the jet ski with the cover off of the carburetors that I would get gas on my hand when I placed it over the carbs. Usually with outboard motors, this means that the reed valves are bad. Is this a sign of a bad rotary valve? I am not very familiar with the way the jet ski intake system closes off during its cycle. Any other ideas are greatly appreciated.

Thanks,
Nate

 

[Jeff Walkowiak]

Re: Sea Doo '97 GTX High Speed Problems

the rotary valve may have been damaged by water it should not be leaking or you may need to carefully inspect the exhaust hoses and water box for obstructions or hoses with loose interior walls causing a blockage. and be sure the raves are in good working order