SX/SXi/SXi Pro '92 750 sx cavitating problem

[Warpman89]

Hello,

I need some help here. My 750 has bad cavitation problems at low end, low speed operation. The engine runs great but is not pumping water. I have a '91 650 sx that performs better at lower speeds which surprises me because the 750 has more power. Are there any common areas to check on the ski where air could get into the impeller? I realize that if the intake is out of the water air will get in, the problem I am having occurs when my weight is shifted back, nose is up, and I am trying to plane with intake in water. On my 650 in the same position getting out of the water is not a problem. On my 750, without easing the throttle and shifting my weight forward, my ski will not plane. Any ideas?

 

[JetSkiBrah]

I'm sure the chances that you checked this already are high, but did you look at the intake grate and above it? i had this problem once last summer, and i looked. and it was just a stupid wad of weeds stuffed up in the pump that were restricting water flow. just a thought.

 

[sxipro02]

...or damage to impeller, it dosent take much of a bend to mess up flow

 

[hullsmasher85]

U can fill ur pump shoe that helps. I used 2in or great expandable foam and some epoxy for the back. Also check n make sure ur pump seal (rubber) is still good and intact