I have a 40hp Mariner 2 stroke outboard. My problems started when I kept fouling plugs from idling for long periods of time.(I run at idle a lot through shallow creeks to get to my top fishing spots) Someone told me I was running too rich, therefore fouling the plugs. I adjusted the fuel/air mixture and got the motor running like a champ. I took her out on a test drive and everything seemed fine. I came back the next day and the engine was seized. I was able to put a wrench on the crankshaft and unseize it. After that I tried to run it again, it ran for maybe 10 secs and I noticed it wasn't firing on the top cylinder. I pulled the top cylinder plug and it was fouled. I then came back a couple days later to put a new plug in and the motor was seized... again. This time I can't free it. I poured marvel mystery oil into the plug holes and I am going to let it sit for a couple days and try again. Any one know why it would be seizing? I am mechanically inclined however I don't have much experience with outboards. Any help would be greatly appreciated. Here is all the info on the outboard
Mariner 40 hp Stroke, twin carb
Serial #6E9-409257
I am not sure of the year, I think its 86-89??
Mariner 40 hp Stroke, twin carb
Serial #6E9-409257
I am not sure of the year, I think its 86-89??