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Motor revs up but NO acceleration HELP!

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etxph0nehome

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I took my seadoo out yesterday to the lake. it is my first time taking it out since i got it from my uncle. it is a 95 spx with a 657 motor. it was sitting for a couple years. i rebuilt the carbs, blew out the fuel lines and flushed the tank, changed the oil lines, new spark plugs, new battery, and put new motor mounts.

the seadoo starts right up and the motor sounds awesome. the problem is when i go to gas it in the water, it will just rev up and barely move. if i play with the gas itll eventually gain speed and run fine in top speed. i was told it may be the impeller or wear rings. what do you guys think? and how hard is it to fix this.
 
i would also like to add that this problem is 10x worse when riding 2 people. when i get on it myself its not bad at all.
 
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