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Problem I can't figure out. 96 seadoo Help Please

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shahrk beyt

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Info: got a great deal and bought a 1996 Seadoo GSX Bombardier (used, about 100 hours).

Problem: everything works great except for the fact that when its in the water, it won't go past 3500 rpms. I have tried everything I could think of, but can't figure it out.

Things I've Tried: we have ran new fuel lines and made sure they weren't clogged. Checked compression (sits at 750 for each). cleaned out the RAVE valves. checked the recifier. check the battery, spark plugs, and fuses. changed oil filters.

Update on situation. So we replaced the rectifier. We saw an improvement slightly. When tested, it went past 3000 to about almost 5000 but then bogged back down to 3000. Then the engine turned off basically. So we got it back on the trailer. We heard this humming noise. I removed the key and dc'd the battery. i went to reconnect the battery and as soon as i touched the second battery cable to the battery the engine started cranking, wont start just cranks. Then we got a new soleniod and replaced that. But it continues to do the same thing. I did some research and it sounds like it could be the CDI box? I'm not sure what else it could be. Maybe the DESS post, but the key didn't make a difference when it was on the post or not. Let me know what your thoughts are please. Also if it is the CDI box, does that have to be programmed?
 
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The CDI box is full of parts and they are not all bad. For it to crank constantly it must have 12v on the yellow wire with the red stripe. Not the one that goes out to the start/stop button but the one in the harness going from the rear black box up to the grey box.Trace it up into the grey box and see if the yellow/red has power where it comes out of the MPEM.

Yes the MPEM is programmed to the key.
 
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