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Why so slow?

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The wire tie will tell you if there isn't enough pressure on the surface due to wear of the carbon ring. As long as there is meat left and a bit of pressure it shouldn't leak. I've seen them worn down almost to the bellows and not leak. If the seal is cracked no amount of pressure will seal it. I'd look to the wear ring as you already need to take a good bit of the steering parts and nozzle off to change the pump oil, which should be done anyways if you haven't already. Changing the wear ring is only a few more bolts and another couple hours of work.
 
Your ski is definitely running slow. I was happy to read that your compression readings came out good. Strizzo above mentioned the wear ring. You should take a good look at your wear ring and make sure that there are no chunks missing out of it.

Are you adjusting the trim for best top speed? I don't believe the trim would knock off that much top speed but who knows? Adjust that trim "nose up" for best top speed.
 
dannyual767 said:
Your ski is definitely running slow. I was happy to read that your compression readings came out good. Strizzo above mentioned the wear ring. You should take a good look at your wear ring and make sure that there are no chunks missing out of it.

Are you adjusting the trim for best top speed? I don't believe the trim would knock off that much top speed but who knows? Adjust that trim "nose up" for best top speed.
Click to expand...

The GTX RFi doesn't have adjustable trim. Maybe I'm so tired right now I forgot it does. My XP does. My Polaris does. I don't think the GTX Rfi has adjustable trim.
 
The GTX rfi's do not have trim.....after reading everything here to me it sounds like a wear ring is to blame. I had a GTI I was working on a few months ago.....same issues as described here....wear ring didn't look bad but the clearance was too much. New wear ring fixed the issue.
 
I took the pwc's out today. I brought along my Garmin Nuvi GPS. The "fast" one only got up to 45mph @ 6850 rpm. Then I got on the "slow" one. It's been a while since I've ridden it (my step-daughter usually rides that one). I forgot what a dog it is coming out of the hole. Just pathetic. The max speed was 35mph @ 6500 rpm.

I crawled under the ski the other day and looked through the water inlet grate. The impeller (prop) looked pretty dinged up. I'm going to take the jet pump apart, replace the wear ring, and either send the impeller to a prop shop for repair or buy another one. The local prop shop (Mike Hood's) will repair it for $100. That's a lot less than replacing it.
 
What these guys are telling you is correct, I have a 01 DI after a ton of work on both of them, one was the same, a dog out of the hole, once up on the water it would pick up, after the season, I took the pumps apart and rebuilt them, the wear rings were toast, new bearings and seals, delrin wear ring, solas prop, and intake grate, man what a difference, Im with them, the wear ring is probably the culprit, im a believer,
 
When I took the jet pump off, there was a thin silicone or rubber ring between the jet pump assembly and the ski. I'm told that's called a neoprene seal (although it's more like rubber) and it reduces cavitation. My schematic doesn't show one of those. I'm also told I could use something like 3M 5200 to create a seal there. Any comments on this?
 
I would just use the neoprene seal and use the 5200 around the bailer fittings.... I know that's what many members have done including myself and it works greay
 
This is the ring I'm talking about. I'm not sure if this is the neoprene seal or good job of silicone setting up.

HPIM0883.jpg
 
Really hard to tell from the pic but that actually looks like silicone lol.... The neoprene ring is usually a grey color.... U don't HAVE to use a neoprene ring, but to me it's a lot easier and makes any further pump removal much easier.... Just my 2
 
griz400 said:
your choice i guess. and sbt exchange is 60.00, a new one, is 160.00, when i take something apart, i look for an upgrade ..
guess i dont know anything though ..
good luck with your ski
Click to expand...

Dude, what's up with the attitude? A post a week ago telling me where I could find this "upgrade" you speak of would have been helpful. These comments...not so much. I would expect better from someone rated "SeaDoo Forum Hall Of Fame"
 
I reattached the impeller to the shaft. It spun rather freely. Then I attached the cone and added oil. Suddenly the impeller is hard to turn. Is that because the shaft is pressed against the pusher & spring?
 
You've probably pinched either the thrust bearing or thrust washer (easy to do, most of us have done it), and when you re-attached the cone it caused the impeller shaft to rub on the cone.

Lou
 
Thanks, Lou.

I removed the plug from the fill hole and captured the oil. I loosened the three bolts that hold the cone on, maybe 3 turns each. The impeller began turning freely. I retightened the three bolts, making sure the impeller continued to spin freely. Refilled the oil. Still spinning easy.

I'm excited to get the ski re-assembled and on the water to see what the improvement may be.
 
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