Seadoo gsx 98 wouldn’t go more than 5miles \hr with high RPM

[Da.Doctor]

dear members plz help !
My sea doo gsx wouldn’t go faster than 5 miles /hr with full throttle and rpm around 4000/min .plz note, I replaced the wearring but still having the same issue .

your advice would be highly appreciated.

 

[RockwallRick]

I had the same problem with my 97 GSX, fixed it by replacing the wear ring. Did you put a neoprene seal between the pump and the hull?

 

[JeremyD615]

It’s cavitation, and can be caused by excessive clearance between the wear ring and impeller, debris lodged in the pump somewhere, or air leaking into pump. The carbon seal is a likely candidate since you’ve replaced the wear ring, but post a picture of your impeller first. Let’s see if it’s worn or bent...

 

[mikidymac]

Full throttle should be 6800 rpm not 4,000. But even at 4000 you should be more than 5mph.
How was the rubber pump seal?

 

[Da.Doctor]

No a

I had the same problem with my 97 GSX, fixed it by replacing the wear ring. Did you put a neoprene seal between the pump and the hull?

I didn’t put any seal

 

[Tyman2020]

No a
I didn’t put any seal

There needs to be a seal between the pump and hull of the ski. They are on ebay for under 15 but im sure you sucked air through the gap and destroyed you wear ring aswell….only way to tell is to remove the pump

 

[Da.Doctor]

It’s cavitation, and can be caused by excessive clearance between the wear ring and impeller, debris lodged in the pump somewhere, or air leaking into pump. The carbon seal is a likely candidate since you’ve replaced the wear ring, but post a picture of your impeller first. Let’s see if it’s worn or bent...

 

[Da.Doctor]

Thank you all for help ,but is there any chance that the cuase of this problem is electrical or sensor ?I am confused

 

[Pope]

Not likely. These machines are fairly simple in how they run. Either fuel isn't getting into the engine with the right amount of air or the power it generates isnt getting to the water. From what the guys above have posted, I would be inclined to think it is more about power getting to the water.

 

[Tyman2020]

YOU NEED A SEAL BETWEEN YOUR PUMP AND HULL

 

[Pope]

Found this that might be helpful.

https://www.seadooforum.com/threads/how-to-changing-your-wear-ring.28293/

 

[JeremyD615]

Your wear ring looks good and the impeller appears to be in decent shape. Try to reassemble it with a neoprene seal between the pump and hull and that may fix your problem.

 

[Tyman2020]

https://www.ebay.com/itm/Sea-Doo-98...475271&hash=item3b44fe8ea8:g:aA8AAOSwq~9eiQSR
Heres the one you need bud.

 

[mikidymac]

What ski are we working on here?
A 1998 GSX doesn't have a yellow hull.
The pump looks like a 140mm not a 155mm?

If it isn't a 155mm pump the seal above will not work.

 

[Tyman2020]

It says its a 98 gsx limited thought those only game with the 155mm pump?

 

[mikidymac]

It says its a 98 gsx limited thought those only game with the 155mm pump?

You are correct but his hull is yellow and the pump looks like a 140mm and both would not be a 98' GSX which is what is confusing.....

Just don't want him to order the wrong size pump seal.

 

[Da.Doctor]

What ski are we working on here?
A 1998 GSX doesn't have a yellow hull.
The pump looks like a 140mm not a 155mm?

If it isn't a 155mm pump the seal above will not work.

 

[mikidymac]

Well....
That is a 1999 GSX RFI and uses the 140mm pump so you will need the neoprene pump seal....

293200024
Neoprene Seal
MSRP: $10.49
Dealer Price: $10.49

 

[Da.Doctor]

I applied neoprene seal 140mm (found it in local store )but still the same problem ,,but i found that all cooling tubes which comes from the engine was completely clogged with sand then I tried the jet again after cleaning all the yellow tubes but still the same problem ....plz note that the RPM in water doesnt increase above 3500RPM ,,,,Im still confused !

 

[Da.Doctor]

Is there a limp mode on this jet ?

 

[WaarrEagle]

You may have engine problems too, but if the engine is really running 3500 RPM then you should be getting more than 5MPH. Something is wrong on the back end with your pump/impeller/seal/etc.

 

[Tyman2020]

Are your revs limited? If not your not in limp mode. And this should not keep you from only going 5mph....4000 rpm should be about 30. Depending on your size. It sucks that it wasnt as somthing as simple as the seal. How does it run through the range of rpm and what is that range. Your not giving us very much to work off of. Did you do somthing to cause this issue? The impeller and wear ring look good but at this point im at a loss unless your impeller is fu*****....

 

[Da.Doctor]

The

Are your revs limited? If not your not in limp mode. And this should not keep you from only going 5mph....4000 rpm should be about 30. Depending on your size. It sucks that it wasnt as somthing as simple as the seal. How does it run through the range of rpm and what is that range. Your not giving us very much to work off of. Did you do somthing to cause this issue? The impeller and wear ring look good but at this point im at a loss unless your impeller is fu*****....

problem sterted when I started the ski in very shollow water almost touching the beach ground and I tried to accelerate,,aftr that immediately the problem started which associated with high temp as well,,,then I changed the wearring and seal which was not helpfull ,,,yesterday I found that the cooling tubes was full of sand (obstruction 100%) aftr cleaning it still the same condition

 

[Da.Doctor]

O

You may have engine problems too, but if the engine is really running 3500 RPM then you should be getting more than 5MPH. Something is wrong on the back end with your pump/impeller/seal/etc.

Thank u for replay, out of water the jet runs great and smooth the RPM can reach more than 7000RPM but in water can reach 3400 rpm only

 

[Tyman2020]

O

Thank u for replay, out of water the jet runs great and smooth the RPM can reach more than 7000RPM but in water can reach 3400 rpm only

You should never start a ski in less then 36in or so of water im sure your blocked up somewhere is there any alarms going off? High temp? Trying to think how they route the cooling line out your ski...However it seems to be a load related issue...Did you ride the ski obstructed? Overheat the motor?