95 xp 717 rev limiter problem

[HERTENSTEIN83]

Thanks in advance for help !!! 95 xp 717 stock less than 10 hrs on fresh motor ran great at the end of last season. Only change over winter was the wear ring a new wear ring did help the hole shot but now hits the rev limiter a little before 3/4 and wot i am not sure of the rpms due to tack in-op but any help would be grateful.

 

[seadooya]

inspect yuor "new" wear ring, and throttle linkage

 

[HERTENSTEIN83]

The wear ring looks great no scratches and a gap of .002 to.003. What should i inspect on the throttle linkage ?

 

[Dr Honda]

Yup... check your new ring.

If you can get to your rev-limiter before full throttle... then your pump isn't happy.

While you are in there... check the impeller, the pump seal, the seal on the shoe, and the drive shaft seal. All of those places can draw air, and allow your engine to over rev.

 

[HERTENSTEIN83]

I will tear it back down today and inspect.

 

[HERTENSTEIN83]

After further inspection it has a very tight .008 clearance every looks to be in great shape the only thing i did notice is that there is about .090 of the wear ring sticking out past the housing but on the other end it is flush with no gaps. I did not pay attention to the old wear ring when i replaced it on how much it was sticking out. Is .090 ok or did i purchase the wrong wear ring? or is it ok thanks brad

 

[seadooya]

no, your good, that creates the "seal" against the hull/rideshoe...you may wanna purchase a neoprene seal, and install it between pump and hull. How'dthe impellor look..?

 

[HERTENSTEIN83]

A few minor nicks but nothing i would be worried about. is there any other suggestions before i reinstall the pump or any other suggestions in any other area to check. Thanks for all the help

 

[Bills86e]

thrust problem

Use a sharp object and scribe an alignment mark on the shaft & prop, shaft & PTO. I do this when even tho the splines look and feel good, and observer if a problem persists. Bill

 

[HERTENSTEIN83]

I reinstalled the pump resealed every thing and still the same problem.I read in another tread to check the voltage if too high it would cause this same problem under full rev it was 13.5-13.6 so that should not be the problem either.any body else have any other advise would greatly app.

 

[seadooya]

ok, so far, all you did was replaced the wear ring, and prior to that it ran great. Wear ring replaced, and now at 3/4 throttle, your at WOT...hows the performance, does it jump out of warter, does it idle good..wants to "creep" with no throttle...?

 

[HERTENSTEIN83]

It runs great idles great starts right up the deal was at the end of last year on take of it would rev a little high on the take off and from reading on here i check the wear ring and it had about .080 gap in it so that why i replaced it. I actually drag race build motor etc and its the same on our race cars when you hit the rev limiter i am 100% sure it not fuel related or any thing like that it is def. the rev limiter it hitting thanks

 

[Bills86e]

Impellor
XP 717 Part number=271-000-458 pitch=11-24 material type=SS size=140mm.
You have a "stock" ski, right? A brass houseing?
Check what is in there. Someone may have installed an undersize impellor, or traded
a smaller ski pump assembly.

Nicks and chewed corners of the impellor blade can cause some cavitation, even
when the clearance is in spec. Have you heard or felt any grinding vibration? this
could be the splines disengageing. spline edges should be sharp, not rounded.

 

[voodoo]

On a pre 97 the ring is the same, however a sealant needs to be on the forward face of the pump insert where it meets to the ski body, you should have the early driveshaft bearing/seal that needs greaseing, is your seal tube straight or does it have ridges and move easily along the driveshaft? You may be drawing air thru this seal and just push the rubber back to the next groove for the clip to snap into. When Bill mentioned the scribing lines is to determine if the root and crowns are not slipping on the driveshaft, be careful poking your finger into the grease of the PTO, those sharp metal teeth are like daggers in the grease.

 

[HERTENSTEIN83]

It is the stock impellor and pump as i have done all the work my self it has never been any where else for service. what are you talking about with the clip in the seal? and i did mark a line on the shaft and pto . The line did not change after a couple of quick passes. thanks brad

 

[Dr Honda]

Since your pump is in good shape... I would be pointing my finger at the drive shaft seal. If one of the clamps are loose, or the seal is just in bad shape... it will suck air. (like a drinking straw with a hole in it) Even the slightest leak will cause issues, and it won't leak water back into the boat.

 

[voodoo]

What I refer to is the rubber tube on the driveshaft, the OEM style is a solid tube that meets a seal carrier which has a grease fitting for monthly greasing, look at item 20 --> http://partsfinder.onlinemicrofiche.com/seadooforums/Seadoo_oem/Seadoo_PWC.asp?Type=13&A=27&B=15 <-- the following year a different style with the flexible rubber and many felt this was a wise upgrade to avoid the routine greaseing job, the later style has the clip to adjust the tension on the carbon seal.

 

[HERTENSTEIN83]

I will go pick up some seals and try it. I will kepp you all posted thanks again brad

 

[HERTENSTEIN83]

Installed all the two new seals and the bearing in that carrier regressed even put silicone between the wear ring and shoe and still no luck still having the same problem of the rev limiter between 3/4 and wide open. Its hard to tell but maybe not hitting the limiter as hard as it was. Any other suggestion please !!!!!

 

[voodoo]

I have only replaced about 6 wear rings and the new ones are snug fit to the prop and housing, check the clearance to the housing/wear ring to make sure there is not a lot of space here for the water to sneak past the impellor, awhile back Bill86 mentioned the prop pitch, maybe it is not the right prop?

 

[HERTENSTEIN83]

check all #'s on prop and they all match factory. i bought a tach that works now and when you leave from a dead take off it goes up to 4500 and then carries out too 7100-7200 and it feels like it moving pretty good and starts hitting the limiter if i back off the throttle 1/4 to 1/2 in its ok

 

[Dr Honda]

I'm at a loss, and don't know what to say.

If you don't have cavataion... then the pump is good. If your impeller is the factory unit... then it shouldn't have enough power to get to the rev limiter.

If you bought the ski used... could the nozzle be oversized?

The only thing I can say is to put a steeper pitch impeller in. (or gain some weight)

Do you have any mods?

 

[HERTENSTEIN83]

No after market mods i did do a little port matching when i had it apart for the rebuild but nothing major. New crank kit,new pistons std bore just honed, stock carbs and pipe i got it off a good friend and he never maintained it or worked on i am the only person that has ever touched it. When it hits the limiter it not very hard about every 3-4 seconds apart. The part that gets me is that it used to do it out of the hole never on the top end but sense the wear ring replacement the hole shot is awesome doesn't hit the limiter until top speed thanks brad if a different prop should be used does anybody have a part #