HP limited on 2004 RPX

[Coastiejoe]

67 is pretty close to the top end speed, So I doubt you have a SC or IC issue.

Does the engine get normal high RPM,s but the ski not get good performance? Kind of like flooring a car and the tires spin but you really don't go anywhere?

 

[cadams4lsu]

Yes. Good explanation

 

[cadams4lsu]

It gets to 8100 rpm, which I thought might be high

 

[cadams4lsu]

I had this one up to 71 the weekend before. Hope my wife and daughter didn't suck up a rock or something when they went without me.

 

[ryffish]

well you still needed to address your supercharger issue anyways . ceramic washer failure would of cost you dearly

 

[ryffish]

sounds like cavitation

 

[Coastiejoe]

Ok,, you have a cavitation issue...

It can be the wear ring, Impeller, or the Carbon Seal. In many cases it can also be the drive shaft splines but I am certain that is not your issue based on engine performance.

If you can, take a look at the impeller both through the grate and the rear nozzle and post a picture of the impeller and the wear ring. Zoom in as bet you can, try to show the wear ring where the impeller comes up against it..

 

[cadams4lsu]

Is the wear ring the white collar the impeller is in?

 

[cadams4lsu]

well you still needed to address your supercharger issue anyways . ceramic washer failure would of cost you dearly

Yes. I will take the other off after the season to have it rebuilt.

 

[ryffish]

yes it goes around impeller

 

[ryffish]

coastie is right probably should take,a pic

 

[cadams4lsu]

Will do that when I get home with ski's. About 30 min....will it hurt to ride it like this this weekend?

 

[ryffish]

cavitation can be bad try pulling a tuber with a bad wear ring and impeller or drive shaft you will just spin engine and go nowhere

 

[cadams4lsu]

Yeah, I would just ride this one and not pull anybody

 

[Coastiejoe]

Will do that when I get home with ski's. About 30 min....will it hurt to ride it like this this weekend?

The biggest issue with cavitation is the potential of over heating. If it were mine, I'd not ride it. That said, if you MUST, slow throttle is the answer. Once you are up on plane, cavitation is not much of an issue due to your forward momentum...

 

[cadams4lsu]

 

[Coastiejoe]

The grainy picture shows the edges of the impeller pretty dinged up. Also in the same pic, it looks like the gap is pretty big to me (wear ring to impeller edge).

Could be the angle, but I am pretty confident you have an impeller and wear ring issue. The impeller can be filled smooth if it isn't to beat up.

IMO, you are to the point where you pretty well must pull the pump. Once you do so, you will also be able to see the wear ring and impeller much better.

 

[cadams4lsu]

Thanks for helping a newbie yiu guys.
How do you pull the pump? And how easy is it/costly to replace these two things? Do they come as a pair? And what size prop for what I have?

 

[ryffish]

you can pull the pump off as an assembly you will see 4 large bolts holding it to the hull . Then put assembly on the bench and separate the venturi from the jet pump. you will have to disconnect steering ,vts,and opas water line held on by hose clamp. You probably should download service manual from the forum as a helper

 

[Coastiejoe]

I did this write up on how to change the Gear Oil in the nose cone for a non-IBR ski. Follow these steps and you will pull the pump pretty easily..

http://www.seadooforum.com/showthread.php?84514-4-Tec-Jet-Pump-Grease-Change-(Nose-cone-oil)

 

[cadams4lsu]