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90 hp sportjet wont rev past 4200 rpms need help

Ok I'll be making a trip to the boat yard tommarrow haha. Thanks for all your help
 
Also I haven't changed the stator fluid. What would be symptoms of old bad stator fluid.
 
Did you check the vent hoses between carbs? Mine were plugged solid. Ran good after that but just developed a new issue. I think I have a leaky needle valve. But when the boat ran good, I got 41mph on the speeds, not GPS
 
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