1995 GTX Problems

[JDolson 22]

When we test drove our GTX before buying it we realized that when we gave it gas it would rev up but not go anywhere. After a little while of holding it it would finally get up and move. After we bought it we changed the wear ring and impeller, on the first day out on the water with us owning it, it performed spectacular for the first few hours. All of a sudden that same problem came back and the wear ring is perfectly fine. Sometimes it will bog down also. The previous owner stated that he put additional oil in the gas so we figured that was the problem and we ran the tank out, then filled it with fresh "super" gas. The problem still persisted, so we changed the spark plugs and it was great for 5 minutes and then went back to its old ways. Does anyone have any ideas, it runs fine out of water.

Problem #2
Just before we put it away for winter, the ski was overheating. The paint burned off of the top of the exhaust pipe coming off the engine. I blew in the lines and they appeared to be clear, any ideas. THANK YOU IN ADVANCE!

 

[Coastiejoe]

All of a sudden that same problem came back and the wear ring is perfectly fine. !

Make sure there is NOTHING in the impeller area. Something as small as a twig can create serious cavitation.
Another way you will get cavitation assuming the the wear ring and impeller are good is the Carbon Seal. If it is bad, it will suck air from inside the hull and the air goes to the impeller next. So, the impeller spins freely due to the air.

Bogging Issue: Does your ski still have Grey Tempo Fuel Lines? If you don't know, take a look at them and or post a picture of them. If you do still have them, then need replace NOW... We will give more details as to why and what you need to do if you have them.

 

[Mickirig1]

Keep reading. If you have a carb, it is a fuel issue. Clogged internal filter in carb. Cogged fuel filter / water seperator up front. Carb may need rebuild. You have to make sure all your cooling lines are clear. Including the small black lines and big ones. If your sucking air you are not moving water.

 

[JDolson 22]

Most of the lines were replaced with green tubing, I remember seeing a small section of gray tubing. The ski is stored at the shore for the winter, so I will look at it when I am down there again.

If the carbon seal is bad, wouldn't the ski leak water inside from where the driveshaft exits?

 

[Coastiejoe]

If the carbon seal is bad, wouldn't the ski leak water inside from where the driveshaft exits?

Generally not. The draw (Venturi effect) is substantial when water is moving below the ski. As soon as the impeller starts to spin at high RPM's, water is moving under the ski even if the ski is not moving very well. So, as water passes the shaft and impeller area, the air is sucked from the hull.

Post a picture of yours, we can often tell by how thick it is.

 

[Jet Set Performance]

1995 GTX will not have a carbon seal set up, it has the bearing setup instead. Some things to check for are make sure the bearings & seals in that setup are in tact and in good shape, the hose that supports that bearing seal is not broken, torn, clamps in place, make sure where the hose mounts to the hull is not damaged from a seized bearing, and lastly, check the motor mounts.