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i have a 85 js440 with some work done to it, not sure whats inside but do know it has a coffman pipe on it. im new to the jet ski world and im not sure of the temp a ski should run at. My first time on a stand up (this ski) it seemed as if the exhaust temp was way too hot. ive owned jet boats for the past 3 years and getting them to opperating temp is usually the problem not overheating. any help is greatly appreciated and any tips are welcomed. i do know the motor runs good and strong under load. now being my first time on a stand i spent some time on my knees:dunno: riding it and the pump was cavatating a bit but once standing up it was fine, not sure if that would cause the issue either. and yes i do have water coming out the side dump and pipe. it does seem skimpy to me but again im a noob
 

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it seemed as if the exhaust temp was way too hot.



the pump was cavatating a bit but once standing up it was fine, not sure if that would cause the issue either. and yes i do have water coming out the side dump and pipe. it does seem skimpy to me but again im a noob
As long as you can put your hand on the exhaust at operating temp and not cook your skin off then you are fine.

The cavitation shouldn't effect it much but could have played a minor role. Keep your weight as far forward as possible when standing or kneeling this will prevent porpoising and keep the pump full of water.
 
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