Thanks I have got a lot of great info of this site. I recently bought a 96 seadoo challanger from a guy that was supposedly very mechaniclly inclined and the boat was running wonderfull. It starts and idles fine but as soon as I open up the throttle it sounds like a rev limiter is kicking in. I have cleaned the rave valves and checked the carbs. Does any body have a idea what else may cause this. Thanks!!