Boat sat for 2 yrs before i got it chaecked the oil it was a milkshake my first thought was exsaust manifold so i took it off and where the carb mounts is all rusty inside also ports 2and3 and ports 6and7 of the exsaust are full of rust and same ports on engine are rusted pretty bad the exsaust ports are gray does this sound like a bad manifold it also overheated and checked spark plugs num 2 cyl had a few water drops on plug
