I have a used 2003 225 mercury 4 stoke. It idles smooth but when you try to get up on plane the engine bogs down Ive been trying to get a diagnostic program to run some tests. But i havent been able to get my hands on a mercury diag. set. The motor had been sunk in the ocean for a bout an hour. and has some light oxidation. Some of the electronics i fear are suffering from resistance problems becuase of the oxidation but im trying to narrow down what would make the power drop off under load. My guess would be the coil packs but i dont know much about this motor. If you have any ideas please write back.
