95 xp 720

[blaster]

I just bought a 95 XP 720 and it runs fine at top speed but it seems to cavitate when i take off any sugestions? also i have some wires and hoses that are not pluged in tried to figure what they were but the digram is confusing?

 

[vilord]

Eew, gray fuel hoses!

Cavitation problem: being that old, the pump may just need to be resealed. Pull the pump and have a look-see at the impeller and wear ring, then reseal and reassemble if the ring and impeller are okay.

Don't know wiring on that machine, so can't help there, but the fuel lines that are not connected may be related to the reserve tank switch... if you switch to reserve does it work, or does it run out of fuel?
Picture #2 shows a vent line that should be venting out under the seat, not into the bilge.

Lastly, the gray fuel lines that you have there are GOING to disintegrate, from the inside out. If you want to save yourself rebuilding carbs and replacing filters, replace all of that gray hose NOW.

 

[blaster]

thanx .... i'll get right on it .... havn't tried the reserve yet

 

[vilord]

Cool, let us know how it goes! For the fuel lines if you do a search on here there's guides of what to get where and how to replace everything.

As for figuring out where all the hoses are supposed to go, I looked at the parts guides online, and joined premium so I could get the service manual... turned out on my boat, the fuel lines and oil lines were connected together, so it was worth the time to investigate!

 

[blaster]

I have the service manual and I cant get the impeller housing of the hull ..... do you know where to find an impleller housing remover. googled it but nothing. Oh those 3 wires are for the VTS system they are unpluged and the wires are in the back.....not going to mess with this problem till I get this cavitation thing fixed. I decided to replace all hoses (oil/gas). got half of them done today after i couldn't get the housing off

 

[vilord]

To pry the pump off the hull on my boat, I took a regular pry-bar from sears like this one.

Wrap the angled end in electrical tape, then hook it under the corners of the pump and work it off SLOWLY.

This instruction came from the '97 challenger shop manual, but should apply to any of the similar boats/skis.

 

[timmyboy76]

I have the service manual and I cant get the impeller housing of the hull ..... do you know where to find an impleller housing remover. googled it but nothing. Oh those 3 wires are for the VTS system they are unpluged and the wires are in the back.....not going to mess with this problem till I get this cavitation thing fixed. I decided to replace all hoses (oil/gas). got half of them done today after i couldn't get the housing off

Hey Blaster, if nozzle was in upward/downward position prior to unplug'n the "vts", then you'll get the cavitation syptom/bad performance as well

 

[blaster]

will try tomarrow ..... after i reseal it ...... should i wait for it to dry or can i water test it after an hour?

 

[blaster]

Hey Blaster, if nozzle was in upward/downward position prior to unplug'n the "vts", then you'll get the cavitation syptom/bad performance as well

well i an going to rebuild the pump anyways .... right now the nozzle is level ...... how can it cause cavitation only when takuing off

 

[seadoosnipe]

Vts?.........

Vilord has given you some great advice, I hope you can work on the issues he's pointed out. The fuel lines and the vent that should be coming out from under your seat, should be taken care at first chance.

The cavitation is probably not true cavitation. It's being caused by the VTS not being used to allow transition from take off to plane. This is very important in distributing weight to thrust ratio for proper take off....

Good eye timmyboy!..........:cheers: to all.

 

[blaster]

good stuff guys ...... so this is what i am going to do. I am not going to pull the pump then and going to finish up the fuel and oil lines. and work on the vts .... is this a good idea? thanks again guys for all your help

 

[vilord]

From what seadoosnipe said, yeah give that a shot first. At least then you can get in the water

If it still has cavitation issues you may still want to reseal next.

 

[seadoosnipe]

Yes.......

:agree:......try to get the VTS working correctly so that you can adjust the nozzle down on start, then power it up as your gain speed. This is the proper way to take off with your ski..........

Like vilord said, if you still have problems, then resealing the pump may be necessary. You can also be sucking air through the engine compartment where the shaft passes through to the impeller.:cheers: