2003 Sportster 150. WOT from a Dead Stop.

[seadoo-soto]

Please tell me if this is normal. From a dead stop, I gun it, and the boat just kinda spins out, almost like its not getting traction. I know a bout doesn't get traction but you get my drift. I have to gradually give it throttle from a dead stop. Is this normal? Is this because the boat is small or what?

 

[ssmedt]

I have a 15ft challenger with the twin 717cc engines and mine goes straight when i give it WOT from dead stop. i wonder if your neutral/reverse lever is not keeping the reverse plate (not sure what it is called that thing that sends part of the jet forward to allow N and R) if that is comming down a little bit that might affect preformanc, I also have an 96 GTX that i have to hold the lever down or it tends to pop slightly into N

 

[Gunsrunner]

It is called cavitation, and is normaly caused by a worn wear ring.
The wear ring is a piece of plastic/rubber that fits closely around the impeller, to almost create a seal so that water cannot get around the blades but has to pass through them.
If this is worn or pitted it causes cavitation wich is like doing a burnout in a car, all noise and no go!!!:rofl:
P.S. I luv the smell of burning rubber!!!!:hurray:

 

[sporsterjoel]

Im 99% sure it needs a new wear ring. have a look there should be almost no clearance between the impeller & wear ring. "I think" the gap between the two is only 0.35mm. If you have a shop manual there easy to change.:cheers:

 

[seadoo-soto]

Is there anywhere online that I can see a diagram online of this?

 

[sporsterjoel]

If you dont like going to dealers for repairs then get your self a shop manual. What do you want to know? Get under the boat and look in the pump intake, you see the impeller and there will be a white ring that goes around the impeller. THAT is the wear ring.

Manual say this: Using a feeler guage with 30cm (12in) blades measure clearance between impeller blade tip and wear ring. Measure each blade at is center. Clearance should NOT exceed 0.35mm (.014in)

 

[seadoo-soto]

Thanks for the help man!

 

[seadoo-soto]

Okay, so I looked at the impeller. It looks fine to my knowledge. But the wear ring, I have no clue. I don't see a wear ring or I don't know what it's suppose to look like.

 

[seadoo-soto]

Okay so I put together another assumption. Tell me if if makes sense. I think the reason it raps out at WOT is because of the pitch of the boat. From a dead stop I punch it and the nose sticks straight up! I had some one sit in the front and it helped this problem a lot. What should I do? I can't have someone sit at the nose of the boat all the time!

 

[seadoo-soto]

Anyone have a clue?

 

[markj602]

don't punch it. give it like half throttle for 1 or 2 secs, then go all the way. i have to do the same thing when i'm pulling wakeboards

 

[seadoosnipe]

Wearing ring?

Here is an exploded view of your pump. Anytime you want to see something up close and personal, use the parts link above on the right. The wearing ring is part #8 http://partsfinder.onlinemicrofiche.com/seadooforums/Seadoo_oem/Seadoo_JB.asp?Type=13&A=97&B=14

From what your saying though, I don't think the problem is the wearing ring, if you can punch it and the boat stands on end. This sounds like a nozzle problem. How long have you owned the boat? Has the nozzle been worked on or changed?

Check your nozzle angle or if you just bought it, check it for a wedge.

 

[sporsterjoel]

Still sound like a wears ring to me. How many hr on the boat and how long have you owned it????? I have the same boat and mine hooks up hard no hesitation at all. Have you check the wear ring, its the piece that surounds the impeller. i GUESS IT COULD be a nozzel problem but i would think that it would also affect your stearing. Another thing to check it the rev grate make sure it not blocking the nozzel when in fwd. BUT BUT BUT you need to check you wear ring. If you give it WOT and the RPM's redline then its the wearring

 

[seadoo-soto]

Now that yo mention steering, I do have to forcefully hold it straight. Does that mean anything?

 

[sporsterjoel]

Ya that sounds a little wierd. Get a friends to turn the wheel while you look at the the pump, check the alignment and that it move freely

 

[seadoo-soto]

Okay, guys. This new theme is killing me!

I took the boat to an auhorized Seadoo service dealer. He said my boat is in immaculate shape and the wear ring and impeller look brand new. The cavitating he said, is going to be normal with the non super charged engine. What are your thoughts?

 

[05GTXSC]

Wouldn't that be the opposite because we have the 05 GTX SC and my neighbor has the 08 GTX 155 and mine stands straight up and blows by her on the start but she usually gets going faster like mine is all show and no speed and then I walk away once we get over plane I don't know if there is a big difference between the boat and ski but just some of the facts i have seen.

 

[sporsterjoel]

Okay, guys. This new theme is killing me!

I took the boat to an auhorized Seadoo service dealer. He said my boat is in immaculate shape and the wear ring and impeller look brand new. The cavitating he said, is going to be normal with the non super charged engine. What are your thoughts?

Like i said in the past i have the same boat as you and i have ZERO cavitation. If they checked the wear ring what was the tolerance? It shouldnt exceed 0.35mm there is a BIG diffrence between LOOKING at it and actually measuring it.

 

[swill777]

You might wanna check the thru-hull seal and carbon-carrier seal. Mine wasn't lining up right, and it was causing a TON of cavitation. I couldn't believe that tiny "breach" did so much. Just a thought if you have never checked it out.

 

[Gunsrunner]

PLease answer this for us,
When you give it full throttle from a standing start it should only take about 5 seconds to be on plane and heading for top speed, is this the case with your's?
Are you getting full rev's i think it is 8200rpm?
If not, there is a problem with cavitation in the jet pump and there is no way that cavitation is normal.

 

[seadoo-soto]

PLease answer this for us,
When you give it full throttle from a standing start it should only take about 5 seconds to be on plane and heading for top speed, is this the case with your's?
Are you getting full rev's i think it is 8200rpm?
If not, there is a problem with cavitation in the jet pump and there is no way that cavitation is normal.

From a dead stop, I punch it and it will spin out for more than 5 seconds before it gets going.

 

[Craigmri]

You mean you punch it, the engine RPMs rev up and the boat doesnt move??? or it just pulls slow at first??

Craig

 

[seadoo-soto]

You mean you punch it, the engine RPMs rev up and the boat doesnt move??? or it just pulls slow at first??

Craig

I punch it, the nose of the boat points up, it moves slow, the rpm's go to max, it gets really loud, and I have to let off the throttle to allow the boat to pan out.

 

[sporsterjoel]

Is this a new problem or was it like this when you bought the boat???? ALSO what the deal with the wear ring did you measure it?????? You have a cavatation problem witch is most like caused by a wear ring or bad carbon seal. So if you want to find the problem you need to start by ruling things out.

1st) What was the tolerance for the wear ring when it was measured?

2nd) When tied to the dock or anchor for awhile does the boat take on water? If so then its your carbon seal.

You keep comin on here for an answer to your problem but you need to give use more info, Im not trying to be mean but i want to find a solution to your problem. You have all the signs of a bad wear ring. I just put one in my boat last summer and it was doing the same thing as your. Measure the clearance and post it here so we can rule that out and move on to the next thing. Aslo does this problem happen if your just cruzing at say 30mph the punch it will it rev right up or only when first starting?

 

[seadoo-soto]

Below are pictures. It's the best I could do with my blackberry. I bought the boat in January and its done this since I purchased it. Is has 44 hours.