Just bought two '03 GTI LE RFI. Both had recent top-end jobs according to previous owner; he claims each was only hitting on one cylinder. Approx. 30 hrs. on each unit (he let them sit for 2 yrs). Been back twice now to dealer since top-end job. One unit runs great, the other will only go approx. 10 mph @ full throttle. I'm starting to regret the purchase - worried that this is only the surface of worse to come. I thought these two-strokers were pretty reliable. Especially with the low hours. Is this fairly common? The dealer claims the unit runs great in the "tank"? I haven't seen this "tank", but I envision it must be over-sized "bathtub" where they run these units up? I'm pretty new at this (Seadoo's, that is - been a Crownline driver for years) - so any help/advice anyone can give would be appreciated! Thanks!
-
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.
03 GTI LE RFI @ Full Throttle = 10mph
- Thread starter Bossman
- Start date
- Status
Full throttle?
At WOT (wide open throttle) how many rpm do you have? If your engine is spinning up over 7k smoothly, the problem is likely your wearing ring and/or impeller.........
The test tank is like you see it. But, being a jet pump, there is no real way they can determine the thrust.
The jet propulsion works in two parts. In theory, when the impeller first spins up, the water is being sucked into and through the impeller, creating pressure on the nozzle. When the craft starts to move forward, that momentum changes the characteristics of it's operation. Now, the impeller isn't sucking in water, it's being forced into the pump from momentum. The faster you go, the more pressure you put on the low pressure side, the higher the output at the nozzle.
So, in a test tank, winding up to WOT is only allowing the impeller to suck water. The pump is not building its true pressure until your out riding it.
If you can get under it and look into the grate with a flashlight, see if you can tell how close the blades are to the wearing ring. They should be right on it, no more than .040" in clearance. :cheers:
At WOT (wide open throttle) how many rpm do you have? If your engine is spinning up over 7k smoothly, the problem is likely your wearing ring and/or impeller.........
The test tank is like you see it. But, being a jet pump, there is no real way they can determine the thrust.
The jet propulsion works in two parts. In theory, when the impeller first spins up, the water is being sucked into and through the impeller, creating pressure on the nozzle. When the craft starts to move forward, that momentum changes the characteristics of it's operation. Now, the impeller isn't sucking in water, it's being forced into the pump from momentum. The faster you go, the more pressure you put on the low pressure side, the higher the output at the nozzle.
So, in a test tank, winding up to WOT is only allowing the impeller to suck water. The pump is not building its true pressure until your out riding it.
If you can get under it and look into the grate with a flashlight, see if you can tell how close the blades are to the wearing ring. They should be right on it, no more than .040" in clearance. :cheers:
Thanks for the reply, seadoosnipe. I didn't look at the RPM's when I rev'd the engine, but it did seem to "sputter" some. I thought I remembered something about the "true pressure" under load - when I mentioned this to the service manager, his eyes glazed over. I'm thinking I need to find a new dealer. He's got the unit in his shop now. Can't wait to see what he comes up with. Is the wearing ring/impeller problem a common one? With only 33 hrs.?
- Status
