96 GTX Carbon Ring

[Codyth92]

I’ve got a 96 GTX 787 and I’ve had cavitation issues, I’ve replaced the wear ring, impeller ( Nujet Destroyer 15/23 pitch ) and drive shaft is in perfect condition. Carbon ring looks okay but I’m thinking that’s the only thing left. Engine runs great and is revving like it should but isn’t propelling like it should at all. Here’s a picture of the carbon ring. Should I replace the boot as well I case it’s gotten soft or shortened?

 

[GGuillot]

What's the clearance between the impeller and wear ring? Neoprene seal between the pump and hull? How about the wedge in front of the ride plate? is it sealed to the hull? I've never understood how the carbon seal could be a problem, its only job is to keep water out.

 

[Johnnie J]

Mine wasn’t as bad looking as yours and I replaced it and it made a difference! Sea Doo Carbon Seal Drive Line... https://www.amazon.com/dp/B0713RZRLC?ref=yo_pop_ma_swf

 

[jjsinaz]

The reason the carbon seal can cause cavitation it that whenever the ski is running there is extreme negative pressure in the intake tunnel, which causes air to be sucked in through the seal if its not sealing properly. I'm having the same issue with mine and just ordered one of those kits Johnnie references. Hoping that takes care of it