04 Sportster 4tec with high rpm and low power

[Scsifun]

Hi all... I have an 04 sportster 4tec that is running very strange. At about 2000 rpms it run normal but when I give it more power it revs higher but won't get on step. It almost feels like a car with a slipping clutch. Any idea what could cause low power output and high rpms? Strange thing is if I let it plow water for a little while, sometimes it feels like something engages, rpms are normal and it gets on step. However, I'm still not getting top speed. If I try to go from zero to wot it's very noticeable. Again, like a slipping clutch in a car. It's currently with my Seadoo mechanic and he took it out, it did the same thing for him and he pulled it all apart. Seems it has him baffled to. Help!

 

[Joe Starbuck]

Baffled? It is pump cavitation. How long have you had this boat? I ask because this is extremely common and happens every time you suck up seaweed, or a plastic bag. You mechanic will take a close look at the pump and check for a bad wear ring, impeller damage, bad pump/hull seal, or weak carbon shaft seal. He should be less baffled after he pulls it apart.

 

[turbosl2]

Had a similar problem with mine. Debris In the pump sometimes then when I pulled the pumps they were shot! Corroded all to hell. Wear ring shot too