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97 GTX cavitation issue PART 2!!!

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flowmasterman

flowmasterman

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Tried emailing the guys at Impros.com, NO response, so I'm back here with the real PROS :thumbsup: I have a 97 Seadoo Gtx, had horrible cavitation with 2 people on it, wouldn't tow a tube at all. Pulled pump to replace wear ring, come to find out it had a
SD-SC-XII, Solas website list this as a 17.5/24.5 pitch, and stock is a 16/23. Well I had a known to be good pump out of a 96 XP, it had zero cavitation issues, so I took the impeller off it, it should be the 16/23 pitch stock. Put it on, definitely better, but cavitation still there bad, I also just replaced the entire bellows(OEM) NOT WSM, carbon ring, steel collar and grease boot, to eliminate it also. Took it out yesterday, does good with 1 person on it, can pin it wide open with LITTLE cavitation, put 2 people on it, and will cavitate bad unless you ease into the throttle and get on top of the water. OK. My question is, if I go to a 15/23 pitch Solas, would that fix my problem? I am going to use this ski for towing, so I need that "out of the hole" grip if you will, without cavitation, I'm not concerned with top speed. Just a thought, but does the pressure applied from the grease fitting on the PTO actually make a difference if not enough grease is in there? Thanks to ALL for your help, you guys always put me on the right path, I am stumped on this one.


Sent from Yahoo Mail on Android
 
Are you using the old style o ring or the new c clip on the driveshaft to keep the pressure on the carbon seal?



96 XP800!
Keep the 2 strokes alive!
 
I really don't think the cavitation problem is being caused by the impeller, I like Adam's idea, also check for a good seal between the ride shoe and the hull, and the ride shoe and the pump. IE did you use a neoprene seal between the ride shoe and the pump?

Lou
 
Are you sure it is actually cavitation? I know we hear it all the time here but I am not convinced it is always cavitation. When you are at a dead stop or going very slow especially with a load and punch it you are going to get some slipping and cavitation. The engine is going to rev and the engine is going to overpower the capacity of the pump and impeller. There is not going to be a direct and instant transfer of power from the impeller to forward movement. It is just the way it is and all skis do it until you get moving.

I am not saying that some don't have actual fixable cavitation issues but I think some people expect too much especially from the big three seaters.
 
Adam, it had the OLD style o-ring on it, put the NEW style metal ring on it. Lou Doo, this model doesn't show a neoprene seal on the parts list, BUT, I did put one on it. Miki, when I first got the ski, it wouldn't even go with 3 people on it, would just hit the rev limiter and barely try to move. I think that was mostly having that completely wrong impeller on it someone previously put on. Now with myself, at about 170 pounds, and my brother at about 190, it will pull us fine, unless try to take off fast from a stand still "like you would have to towing a towable to get on top of the water". And cavitation to me, is like a clutch slipping on a car, the engine revs up, but doesn't go anywhere. I can ease into the throttle and get it on top of the water and it doesn't cavitate at all after that. What I'm going to use this ski for, is to tow with, so that's why I'm trying to eliminate this problem. And you say that all skis do it, I know its a different ski, but my 96 XP, zero cavitation, and it has all old parts on it. Thanks for everyone's help, I hope we can figure it out, it might just be as good as it going to get, as long as I can get everything on top of the water and moving.
 
If you think it is still cavitation you swap for a different type on intake grate to try to keep the the pump loaded with water all the time. All of those pitches the manufactures list you really can't compare to other manufactures. They all don't use the same system to figure out the pitch. I have Skat-Trak's on mine and I shoot for the swirl design ones. Gives you much better launches and better for tubing. Most of the other designs are for speed which usually means launches are not as good. That is why you might be good with one person and crappy with 2. The OEM ones give you a mix of both launch and topend.

Can look for a used OEM to try that to get your baseline since you don't have the OEM it will be hard for you to compare..
 
I'm running that grate on my XP. I love it, hooks up excellent in chop and the top end loss is not noticeable



96 XP800!
Keep the 2 strokes alive!
 
But if you are truly having a cavitation issue this will not solve it



96 XP800!
Keep the 2 strokes alive!
 
AdamA96XP said:
But if you are truly having a cavitation issue this will not solve it



96 XP800!
Keep the 2 strokes alive!
Click to expand...

It's not "horrible" cavitation like it was when first got the ski, so far everything I have done has improved it. I just want to be able to use it like it was intended for, riding at least 2 up, and possibly 3, and definitely TOWING.
 
That is a grate in the link. Yes Skat pitches them also but there is no standard between companies that is why each company would sell you the same impeller for your ski and they would be different numbered pitches. Skat does 2 main designs the swirl blades overlap each other to chop up vegetation and are better for takes offs/pulling things. The other one is more for performance. Solas does way more designs all a bit different. There is a whole science to these things here. I have never had an issues using the cart the 2 companies make to pick an impeller. Unless you modified your ski's engine you go from the stock chart.
 
I would give Skat-Trak a call. They are very friendly and helpful and would make sure you get the correct impeller for what you want to do.
 
howie099 said:
That is a grate in the link. Yes Skat pitches them also but there is no standard between companies that is why each company would sell you the same impeller for your ski and they would be different numbered pitches. Skat does 2 main designs the swirl blades overlap each other to chop up vegetation and are better for takes offs/pulling things. The other one is more for performance. Solas does way more designs all a bit different. There is a whole science to these things here. I have never had an issues using the cart the 2 companies make to pick an impeller. Unless you modified your ski's engine you go from the stock chart.
Click to expand...

I posted 2 different links, in 2 separate posts, 1 is the grate, and 1 is the impeller. I'll look on the chart they have and see what they recommend.
 
flowmasterman said:
Details,and wiring diagram? Does the limit switch still work to prevent over travel?
Click to expand...


Check out my thread "VTS issue" some forum members provided the links. Also the limit switch does not work. If you go to far you will blow the VTS fuse. Advance and NAPA both sell mini circuit breakers that you replace the fuse with so if you go to far it trips the breaker but will automatically reset once it cools.
 
[MENTION=43106]CReynoldsMIZ[/MENTION] has a clean used VTS box less the motor for a fair price.
 
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