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06 yamaha FXHO overheating ...

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Hello all..
I need some help with my ski. I have an 06 fxho yamaha with only 50 hours on unit that seems to be overheating after 30min on the water at idle after coming down from some speed passes. I take the ski out and run on the hose and it never overheats. All of the water passages seem to be clear as I've smoke tested and vac tested. I have a good stream of water coming out of the port side piss hole when on the hose. I recently noticed the jet housings are separated a little and not quite sealed with a gasket. Im assuming the previous owner had them apart for some reason. Could this be my problem ? If there not a good enough seal for the water intake port in the housing good this cause an overheating? I would assume there is so much force from the impeller that it wouldn't matter if there was a 4 mill gap. Either way I've replaced and repaired just looking for next step if this doesn't solve my problem. Thanks in advance..
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