94 GTX maintence

[gtx94]

I just bought a 1994 Seadoo gtx. It has the rotax motor. I don't know much about these things as I have never owned a PWC. The craft had not been run in about 2 years. I started it yesterday and it fired right up after I changed the spark plugs. What things should I do to before I put it on the water? What should I lube, tighten ect... It has oil in it that is at least a couple years old, should I drain it and put new stuff in? If so what kind of oil? I did pull the old gas out. Other then those minor things I have no idea what else should be done. Any help in this would be greatly appreciated!

Thank you

 

[timmyboy76]

Re: 94 GTX maintence

the oil in there is fine, its 2-stroke oil, doesnt go bad.

With it sat for 2yrs, dont expect it to work. From "repairing" these, the diaphrams and/or the needle assy, are stuck or crusty. Also, the grey fuel lines are NOTORIOUS for breaking down, and causing a blue/green slime in the carbs' filter and the selector switch..(on/off/reserve) switch.

Go ahead and see what she does, might throw a few oz of oil in the gas too, to help rejuvenate the bottom end.

Remove the grey cover from the back of ski, there's 2-zert fittings, 1 on the pto and 1 on the bearing carrier. Hit them wit h2-3 pumps.

 

[gtx94]

Re: 94 GTX maintence

I did fire it up (on the 2 yearopld gas before I drained the tank) after replacing the plugs. So it does run. However, I could not locate a plug in for the garden hose so I did not run it for long, a few seconds.
As far as the grey fuel is concerned can I replace it with a line off of a spool I can buy at the auto parts store or does it have to be from seadoo?
Also the grease I have is marine grade (green). will that be ok for the bearings or do I need "special grease" for that?

 

[timmyboy76]

Re: 94 GTX maintence

like Bond-O down in the boat section says....Any grease is better then No grease.

the quick hose connection is inline with the cooling hose off the head. You'll see a red cap, covering a "white" "T", inline. You'll need the special hose-hook up device (10 buks at seadoo shop).

Yes, the fuel line can be from the roller off the shelf. 30r7 is what i use, a buck a ft.

The ski WILL fire up. The problem will be, when throttle is applied, with load on pump. For the carb to transfer fuel to the "higher" circuit, is where the problem will lye. Either the pressure from case cannot overcome the needle sticking, so no forward thrust and/or the diaphram is hardened and not plyable anymore.

 

[gtx94]

Re: 94 GTX maintence

so assuming the carbs are gummed up from the hose breaking down, will I have to rebuild and/or clean the carbs or can I put some seafoam in the gas tank and run a tank or two of gas through it?

My buddy I bought it from said that after a little riding on it the throttle did not seem to respond quite the way it should. So based on what I have read in the thread as well as other posts this seems to be a likely culprit.

I'm pretty handy with motors, just don't quite enjoy working on carbs

 

[timmyboy76]

Re: 94 GTX maintence

carbs are easy bud. Problem is, is gettingthem off. I think for that yr, the bolts are incorporated into the manifold and not (bolts) ran thru carbs to manifold. So, you'll need to remove the manifold in order to get carbs off. Be careful though, not to remove the rotary valve. If so, you messed up the timing and will need to be re-timed.

No, seafoam will not work. The carbs need to come off and "cleaned". If anything ,you'll need a new diaphram.

 

[gtx94]

Re: 94 GTX maintence

You wouldn't happen to have a part number(s) on that diaphram would you. And this model comes with two carbs if I'm looking at the right picture/information. I'm at work now so I have not looked at it my self, yet.

 

[timmyboy76]

Re: 94 GTX maintence

You wouldn't happen to have a part number(s) on that diaphram would you. And this model comes with two carbs if I'm looking at the right picture/information. I'm at work now so I have not looked at it my self, yet.

Mikuni Super SBN Yamaha Sea Doo Wave Runner 38 44 46 Carb Diaphragm Kit Instoc | eBay

 

[gtx94]

Re: 94 GTX maintence

Okay, I took it out yesterday with (no carb rebuild). It fired up right away and idled very well. I got it on the river and cracked it open. It shot out of the hole well. A few seconds later it bogged down and died. I started it up again with out issue, right away. How ever I increased throttle and the same thing happened.
So today I looked at the carb set up. I did not remove the manifold but did look at the internal fuel filter on the carb closest to the fuel tank, nothing was in it. The filter was clean. I pulled the diaphram from the carb farthest from the motor and checked it out. It was still very flexible and did not show any signs of "stiffing up" or wear.
At this point it looks like I need to remove and rebuild the carbs. I just can't see how to get at the bolts underneath the carbs! It's very tight in there. Any thoughts or advice would be welcome.

 

[timmyboy76]

Re: 94 GTX maintence

your symptom gtx94, is exact to a fuel starvation issue. You got to go through the carbs ,before you do more harm. Rebuilding seadoo 951 for same reason. Filters INSIDE the carbs, especially the pto/rear carb, plugged up.

Only way to get to the bolts, that secure the carbs to manifold, IS to remove the manifold. 4-13mm bolts securing manny to case.