I'm new to the Boating scene and I'm already wondering why I got in it. I bought a 1997 Sea Doo Sportster that was supposed to be in good running condition. I took it out the first time and I thought it seemed a little sluggish when I advanced the throttle. When I pushed it over half throttle the rpms came up, but no speed/thrust. Sorry, there is no tac on it. After reading some of these forums, I pulled the pump assy and found that the impeller was nicked up pretty good, so I ordered a new impeller and wear ring. With the help of one of these threads, I replaced the impeller and wear ring, and went back to the lake only to experience the same problem. When I advance the throttle over halfway, the engine revs very loudly and the back end of the boat kind of sucks down as if trying to get traction, but no speed. I think I understand what you mean when you say "plane" and my boat doesn't want to do that. It won't really level out and glide. It seems like the rear end is always dragging almost like it can't get out of first gear. The clearance on the wear ring is very tight, so I'm wondering if I s/b looking elsewhere. Any suggestions?