low performance 08 kawasaki ultra250x.

[Karn]

Hello,

I need help on 08 kawasaki ultra250x.

I bought the jet in March with 89 hours. The first time we put the jetski in water was going +/- 50km/h.
After that we changed the impeller because the one that was at jetski was a little beat damaged. So once we open the housing we just also the pump bearings.
We changed the supercharger bearing.
The ski was performing better but after that I had issue on the intercooler. What putting water inside. We fixed, we took out the damp valve and replaced with a block plate.
we did a normal maintenance oil, filter and spark plugs.
We put back on the water last weekend but the jetski was not going more then 40km/h.

Any advice on what else I can check?

[steve45]

Welcome aboard, Karn!

There have been several threads about the 250 recently:

http://greenhulk.net/forums/showthread.php?t=289986

http://greenhulk.net/forums/showthread.php?t=290189