2003 gtx 4-tec still not right

[hughjordan]

Hello...I've been having cavitation problems as well as top speed problems with my '03 GTX 4-tec s/c....I did do the s/c kit as well as change the wear ring, and oil change/new plugs at 113 hours....there are now 133 hours on boat. The engine seems strong for sure and the power is there. The best top speed is about 57 mph @7100 rpm.
The big thing is I seen no difference in top end speed, although there is a big difference in less cavitaion.....(there was a groove in the old wear ring 1/4" deep.) The dealer is saying this is a 65 mph boat, but I dunno about that.

I'm still having big time cavitation issues, but it is inconsistent cavitation and it may or may not happen. I has happened ovbiously when pulling a tube, but it can also happen when I'm on by myself.
I'm not sure where to start looking with these problems since I've already done the recommended dealer suggestions.....any thoughts?

Thanks.

 

[kustomkarl]

Check the jet pump and look for any areas that might cause air to pocket in the jet pump. I usually inspect my jet pump closely every couple weeks for inconsistency and use silicone to fill any gaps. It just might be this simple solution that helps.

Karl

 

[hughjordan]

Thanks for your response....so are you checking for gaps where it actually bolts on?