Hello all! I have a 2000 Seadoo GS. Bought brand new from dealer in 2000. Maintained/winterized it as per owners manual and it has never failed me until now. I took it out the other day for the first time since last season and it ran great and all of the sudden it quit thrusting forward. Motor runs great, still. Just won't go forward. Oh, I checked the jet and shaft for any obstruction and its clean/clear. Any ideas?
2000 GS - Revs up but won't go!
- Thread starter dustinw
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Hi and welcome to the SeaDoo forum.
Well it sounds like you're experiencing a condition known as cavitation, most likely you need to replace your wear ring. If this is the first time that this has happened since you've owned your ski you have been very lucky, I usually have to replace mine every 2-3 years.
Here's a thread about how to replace it.
http://www.seadooforum.com/showthread.php?30720-How-To-Changing-Your-Wear-Ring
Lou
Well it sounds like you're experiencing a condition known as cavitation, most likely you need to replace your wear ring. If this is the first time that this has happened since you've owned your ski you have been very lucky, I usually have to replace mine every 2-3 years.
Here's a thread about how to replace it.
http://www.seadooforum.com/showthread.php?30720-How-To-Changing-Your-Wear-Ring
Lou
To not get any power to thrust forward or your ski doesn't move at all in the water, your jet pump isn't working. Your jet pump works off of a impeller prop inside of it and it is spun my the crank shaft from the engine. Check the jet pump to see if it has anything blocking off the intake grate on the bottom of the ski.
Take off your PTO cuppler cover off and rotate it by hand. Please notice if your engine is turning over by doing this. Then have someone look into the jet pump and see if the impeller is rotating when you rotate the PTO cuppler.
If the engine doesn't turn over, then your drive shaft isn't connected to the engine any more and if your impeller isn't turning then you have a drive shaft/impeller issues.
If they both work then you need to replace the wear ring as you are experiencing cavitation in the pump.
This issue can be fixed, but you must narrow down where and what is causing it.
Take off your PTO cuppler cover off and rotate it by hand. Please notice if your engine is turning over by doing this. Then have someone look into the jet pump and see if the impeller is rotating when you rotate the PTO cuppler.
If the engine doesn't turn over, then your drive shaft isn't connected to the engine any more and if your impeller isn't turning then you have a drive shaft/impeller issues.
If they both work then you need to replace the wear ring as you are experiencing cavitation in the pump.
This issue can be fixed, but you must narrow down where and what is causing it.
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I should have said that it does move forward but only at idle speed even while giving it gas. seems like it tries to take off for a split second and cavitates. What I meant when I said it won't move forward is that it wont get up on a plane and stay there. I see now that it makes a big difference in moving some and not moving at all. This leads me to think that LouDoo is correct about the wear ring.
Check the wear ring by having someone flash a light into the intake grate. If you look into the pump from the back side of ski and see large ring of light around the impeller then that is a quick way to tell if you wear ring is bad. Most impeller and wear ring's wall clearance spec is within 0.04" or 1 mm. You can check this with a feeler gauge.
It can also be the spline on the drive shaft as they do fail more often then they should.
I am with the others though, likely a wear ring issue. If you pull the pump to do the job I would pull and look at the drive shaft splines.
I am with the others though, likely a wear ring issue. If you pull the pump to do the job I would pull and look at the drive shaft splines.
Lake Sailor
Active Member
dustinw, be sure to check the intake grate as well. I once picked up a piece of grass on mine, one thin strand, and I couldn't get outta the hole till I removed it.
Takes suprisingly little destroy the proper flow.
Takes suprisingly little destroy the proper flow.
Walid Elbegarmy
Member
I am in the same satiation like yours, took my jet boat to the lake today and raves up to 7k but move on ideal then all the sudden worked fine. Then I lower the speed and tried to go faster again but didn't happen.
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Walid Elbegarmy
Member
I checked the engine compression and it's very good 154 each.
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Walid Elbegarmy
Member
This is how my pump look like and sound like any help and guides is highly appreciated.
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USAF_Pride
Member
Looks like the wear ring is shot. Tough to tell in the pictures, but if you can slide a dime between the impeller and wear ring, it needs to be replaced.
Walid Elbegarmy
Member
Here is the video, hope it work
http://www.youtube.com/watch?v=iE9GAS7Fbng
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http://www.youtube.com/watch?v=iE9GAS7Fbng
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USAF_Pride
Member
That's more than the wear ring!!! You need to pull the pump out either way to get the wear ring or whatever is rattling/grinding fixed.
<mods, can you split the thread?>
Walid Elbegarmy
Member
What do you think will it be
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USAF_Pride
Member
IMO, it sounds like the bearings in the pump. I'll let others offer up an opinion.
Walid Elbegarmy
Member
Thanks, what do you think about the missing drive shaft seal from the impeller, I couldn't see any seal when I checked ( see pix) should be ok like without it?
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USAF_Pride
Member
if you are talking about the plastic sleeve that goes over the shaft, you don't need it.
Sportster-2001-951C-Stock
Well-Known Member
"IMO, it sounds like the bearings in the pump. I'll let others offer up an opinion. "
This: ^
Is that a 5mm gap between the impeller blades and the wear ring? I can see daylight through the jet pump from behind the boat, I think.
I haven't seen the video, but I bet USAF has you on the right track!
This: ^
Is that a 5mm gap between the impeller blades and the wear ring? I can see daylight through the jet pump from behind the boat, I think.
I haven't seen the video, but I bet USAF has you on the right track!
Sportster-2001-951C-Stock
Well-Known Member
I think you mean the collar at the leading edge of the impeller. This piece keeps grease from washing out of the impeller splines.
Walid Elbegarmy
Member
Yes I meant the black plastic collar that goes on the shaft and the impeller. Should I buy one or keep it as it is?
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USAF_Pride
Member
If you are talking about item #16, you do not need it.Sportster-2001-951C-Stock
Well-Known Member
Item #16 is an attempt at trying to avoid wrapping a rop around the drive shaft and causing it to be bent. It doesn't work well and actually can cause more problems than it solves.
There is another plastic piece, a collar the diameter of the shaft by 3/4 inch length that slips onto the shaft before installing the pump. This black plastic collar is intended to help keep grease in the impeller splines from being washed away and yes, I would definitely install this piece if it was missing, and grease those splines inside the impeller before installing the repaired jet pump.
There is another plastic piece, a collar the diameter of the shaft by 3/4 inch length that slips onto the shaft before installing the pump. This black plastic collar is intended to help keep grease in the impeller splines from being washed away and yes, I would definitely install this piece if it was missing, and grease those splines inside the impeller before installing the repaired jet pump.
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