'95 Speedster Propulsion-Need Help

[Alinvictor]

Hi,
I have a 95 speedster and I am verry confused with what is going on. The boat seems to run ok 1/2 of the time. On the lake I am doing around 45mph@7000RPM. This is during the good running half. Sometimes while on the water after a brake when I am trying to move the boat I will have some propulsion up to 4000RPM and is doing around 10mph but as the more tuch I put on the trottle the engine speed jumps to 7000RPM and there is no increase in propulsion at all. It stays at the same 10mph. I have to mention this is happening for both engines at the same time(they both jump from 4000RPM to 7000RPM at the same time) and this event start ocuring sometime at the end of last season. The engines itselfs are running almost perfect and they both start in a millisecond with no hesitations. I am fairly good with the mechanical aspect of an engine but I have totaly no clue where this can come from. I am verry confused I am greatfull for any ideeas you guys can have.

Thanks
Al

 

[Dr Honda]

you are getting cavatation. I would check the pumps... but you will probably find that the carbon seals on the driveshafts need replaced.

 

[kustomkarl]

Al, be sure the wear rings are within the allowed gap of .040". Measure the wear rings to the impellers at the blade center. If it is bigger it could be your problem. Also check the carbon ring on the impeller shaft, where the shaft exits the hull and enters the impeller jet housing, for any leaks or it be brittle and allowing air to leak in after some use.

Karl

 

[Alinvictor]

Thanks for the quick reply,
- Dr. Honda: Please explain me waht you mean by "getting cavatation". I am a newbie in the propulsion systems....
-kustomkarl: I would take a look and measure the gap but is hard for me to think that will alow me to go full speed and after minutes of pause it will not even go 10mph with both engines at 7000rpm.

Also what is the role of the carbon seals you both sugesting? It is a big job to replace all this. I know I have to take out the entire impeller housing but considering I am a level 4-5 mechanic (auto knowdlege) do you consider this a big job?

Thanks

 

[seadoosnipe]

Carbon rings?...

Thanks for the quick reply,
- Dr. Honda: Please explain me waht you mean by "getting cavatation". I am a newbie in the propulsion systems....
-kustomkarl: I would take a look and measure the gap but is hard for me to think that will alow me to go full speed and after minutes of pause it will not even go 10mph with both engines at 7000rpm.

Also what is the role of the carbon seals you both sugesting? It is a big job to replace all this. I know I have to take out the entire impeller housing but considering I am a level 4-5 mechanic (auto knowdlege) do you consider this a big job?

Thanks

The carbon rings provide your water tight seal between the engine compartment and the outer hull of the pump inlet. One is a stationary part attached to the inside hull at the thru hull fitting by expansion boot and the other is a rotating piece attached to your drive shaft.

The air being introduced into your pump suction will cause the cavitation. This is usually the biggest known source of introducing air into your pump suction. The others are usually pump related and happen after pump rebuild, repair or inspection.

Yes, you are qualified to do this if your a mechanic. You do have to remove the pump, then pull your shaft. I didn't look up your year model but I believe yours will be held in place by the circlip and "0" ring.:cheers:

 

[Alinvictor]

Thank seadoosnipe,
this make a lot of sense. It is much easier to suck air than water. I do have one last question. It is possible to take out the entire impeller asembley ot I need to open this up piece by piece? Also when I take this out the shaft has to remain in place or I need to disconect it from PTO?


Thanks

 

[Alinvictor]

Hi,
Also is there any chance that anyone can help me with the right parts# for this job? There are a lot of seals and boots for the propulsion system(drive shaft and impeller housing). Even a referenece number from one of the pictures found at

http://partsfinder.onlinemicrofiche.com/seadooforums/Seadoo_oem/Seadoo_JB.asp?Type=13&A=6&B=14

and

http://partsfinder.onlinemicrofiche.com/seadooforums/Seadoo_oem/Seadoo_JB.asp?Type=13&A=6&B=17

Thank you all for your help
Alinvictor

 

[voodoo]

In 95 you should have grease fitting type bearing/seal block, look for these fittings and grease them - this is a carbon ring on newer machines, notice the smooth rubber labeled item 20 - do not use grease if the rubber has ripples, someone may have made an update but you still need to grease the pto housing item labeled 1, if this rubber has been torn open you have to remove the pump and driveshaft to inspect damage and proceed with practical repairs to keep water out and air in.

 

[Alinvictor]

I discovered the animal...

Hi,
First I would like to thank everyone that had an imput to my thread or it may have a future input.
Today I had the chance to remove my pumps out of the boat. It was quite simple except the removal out of the hull. It was glued with some kind of silicone and I had to use all kind of crowbars to remove them. Anyway I discovered one of the housings had a crack(before I start using force ) and both impellers are kind of damaged. Also there was no more any wear rings (both totaly distroyed). The shafts looks good also the carier needle bearings. I need to change the 2 seals for the carier and rebuild the pumps.

I have some questions if you guys can help:
-Why there are 2 different impellers for left and right? Seadoo list them as diferent part numbers but they are the same specs.
-Can I get impeller housings (or better the hole pumps) from a different year boat? Mine is 1995 but most dealers have only 96 and up. Also I have more cheaper options on ebay.
-What after market impeller option I have for my boat and if you guys have a part number will be great.

So far I don't have any more questions but I will be back...

Thank you alll again,
Al

 

[GIJeff]

I'm not very knowledgeable on this subject, but if you're looking for oem spec remanufactured impellers (I just bought some for my 94 speedster), go to sbtontheweb.com. It's 25 bucks + shipping per impeller, cheapest you'll find.

 

[seadooya]

. It's 25 bucks + shipping per impeller, cheapest you'll find.

This is on an exchange basis...you'll need to send your old ones to them, or that 25 buks jumped up 200 buks each...:ack:

 

[parrothd]

You can buy a used pump off here, ebay, pwctoday..

I think it's 140mm, and pretty much all seadoo use the same pump. If you want to spend the money call dave at Impros, he can recommend new props for your boat, they're probably $200+ each..

 

[parrothd]

There are 2 different props because the 94-95 have a single intake, a poor/bad designed and they tried to fix it with a low and high pitch impeller..