I have a 1992 60 HP Mariner. The last two times I have gone out on my pontoon I have noticed I am running about 1000 RPM's more to generate the same speed. I normally run 4400 RPM's to cruise about 16-17mph, but now I am running 5500. Not sure if my RPM gauge is faulty or something else is going on. I have also noticed that when cruising along I lose power all of a sudden and then it picks back up. Any suggestions? I have changed plugs and also the motor was rebuilt 3 yrs ago and very little use since the rebuild.
