I have a blown 90hp that I originally thought the water pump was out. I had the mechanic take the boat out of water 3 months after problem. (Pontoon that stays in water under covered slip) The pump was good and all thermostats where also good. The number 2 cylinder is burnt and some of the wires melted due to heat. The mechanic thinks I had something wrapped around lower unit that restricted water flow and caused this problem. I have had others to say it was due to fuel mixture, timing issue, etc. because of damage on #2 cylinder. Anyone have opinion?

