2001 GTI. Recently changed impeller, now I have no low-end power.

[insulinman]

2001 SeaDoo GTI. Recently changed my old worn impeller to a SOLAS 10/16 impeller and took it out to the lake yesterday. I ran fantastic, except when going 0-20 mph. It struggles to go until you hit 20, then it's like it kicks in the afterburner. Is this a compatibility issue with my new impeller or could I have messed something up when swapping them? It's worth mentioning that in my work, there is a seal that goes up between the hull and pump that was really stubborn and worn badly. I tried rigging it to stay in place, but it was very loose. Also, if I put it in reverse and full throttle, I'll have full power in the low end right after that.

 

[truck240]

The seal between hull and pump was it foam and was it torn anywhere? The pump seal is a self adhesive foam ring and is very cheap to purchase. The cause of your lack of hole shot could very well be cavitation from a bad pump to hull seal. My suggestion is pull the pump and remove the old seal. Simply get a plastic scrapper and some sort of adhesive remover. Installation of the new one is a simple as peeling the self adhesive backing, lining it up, and sticking it down.

 

[insulinman]

The one that is there is rubber and semi dry rotted. Looks like this one. The first time I put the pump back, it was offset and I could see it hanging in front of the impeller. I redid it and used some light adhesive to set it in place, but it was still iffy.

 

[mikidymac]

You need to get a new seal for that pump. If it is bad it will suck air and cavitate.