I have an 04' rxp i put the riva stage 1 kit in it and everything was running great. Was getting great #'s as well. Though i was riding for about 1 hour then all of a sudden when i take off from stand still it cavitates very heavy then catches, once i get off to plane the ski drives as normal mid to top end it rides fine but when i take off from stand still it just doesnt catch. No clue what the problem is. Does anyone have any info????

How is your wear ring and how did it look prior?

Not sure what the wear ring is. Have you ever heard of this problem before??

Did you ride in shallow water??Sounds like you may have sucked something through the pump.

I checked the pump and it was clean nothing in it. Its weird its only out of the hole once i plane off mid-range to top end it runs perect not even losing top end speed

Just checked wear ring it looks good, I think its the rubber pump seal.

Here are a few other things to inspect:

• Check the impeller nose cone to make sure it's secure.
  
• Check the seal for the pump support where it mates to the hull.
  
• Check the seal for the pump where it mates to the pump support.
  
• Did you seal the intake grate to the pump inlet? You should!

Is the impeller nose cone made of rubber? My dealer told me mine was missing and quoted me $180 to replace. Does this sound right? How difficult is it to replace?

HELL NO, 180.00??? Tell your dealer to go fly a kite! Its like a $5 part just replace it yourself its not that difficult.

This message has been edited. Last edited by: RIVA CREW,

If the cone doesn't solve your problem, try your holeshot in deeper water. My STG II ski needs 4-6' of water to accelerate properly from rest. It cavitates terribly in the shallows, but rips out of the hole in deeper water. Just a thought.

'04 RXP Riva STG II+ (77.3)
'02 XP -(wife)
'01 GPR 1200 Triple (+)

Its definetly not shallow water i was riding in,it happen when i was in ocean. Had to be over 100 feet deep

If you changed your impeller and I'm sure you did the green impeller nose cone has come loose from the impeller. Pull the pump and distress the threds on the nose cone and reinstall. This problem happens more that you would think.

i had a feeling it was the green nose cone too, if it is whats a good way to make sure it dont happen again??

ok took the pump out and found the problem. I dont know what you call it but it looked like a washer with a yellow rubber seal around it. It was not in place it somehow moved over about half an inch i put it back in place with a little marine grade silicone. it fixed the cavitation problem and ski running great i just hope it doesnt move out of whack again.

Hey Joe what #'s are you seeing on your ski where your at?