I have a 2008 Yamaha waverunner. I am concerned since the outflow at the back is rather slow. I cheched the inlet and impeller and did not find obvious problems. It performs well and do not over heat. Should I be concerned?
One in the back has nothing to do with cooling, the one on side of ski is the cooling outlet, see if the hose under the rear deck is crimped or if previous owner tried to block it off. It's only for visual safety, a lot people block them off when pulling tubes.