We have two Polaris Genesis wave runners and one runs but, has no power maybe 5mph max. One day it was running great then we shut it off and then restarted a little later and no power! The unit has approx. 70 hrs. and has had no problems in the past. I've checked the spark on the three cylinders, all spark good. The throttle opens all the way. I disconnected the exhaust temperature sensor in the exhaust manifold to prevent it from limiting the RPMs, but it revs past 3,500 rpm with no problem. We did find that the pop off valve next to the thermostat was seized closed so I fixed that and confirmed the thermostat is working. Found that the orfice that restrict the water sprayed into the exhaust system was clogged, fixed that. Carbs look clean. We live in the Fl panhandle so they are in salt water all the time, so we flush out the engine every time we come home. I would appreciate any suggestions.