I have a 40hp 402 mercury with thunderbolt ignition but I am not sure of the year of this motor so if anyone can tell me the year for sure I would be thankful. The Serial is 4040149<br /> 
<br />(see post: Need help finding year of motor) <br /><br /> I bought a bass buggy pontoon last night from an old man I have worked with for two years. He assured me everything was in good working order. He even told me he used it last week. Anyway I took the boat to the lake today and the thing would not idle at all and when I did get the thing to go down the lake it would not open up. I think I may have made it to 3 or 5 mhp. I drove the boat about 100 yards and turned around, the thing was running so bad. When I got the boat to the bank I took the cover off and water was spraying out the top spark plug. I did a compression test on the top cylinder and got 60 pounds then I did a compression test on the bottom cylinder and got 157 pounds. I also noted the top spark plug was very clean and the bottom plug was black the way most plugs are after a while of use. I am almost sure the water is comming from the cylinder. Can someone give me some Idea of the problem and how much it will run to fix it my self?????????<br /><br />I can not beleve the old man shaffed me, How could he have not known?<br /><br /> I am so in the dog house.
<br />(see post: Need help finding year of motor) <br /><br /> I bought a bass buggy pontoon last night from an old man I have worked with for two years. He assured me everything was in good working order. He even told me he used it last week. Anyway I took the boat to the lake today and the thing would not idle at all and when I did get the thing to go down the lake it would not open up. I think I may have made it to 3 or 5 mhp. I drove the boat about 100 yards and turned around, the thing was running so bad. When I got the boat to the bank I took the cover off and water was spraying out the top spark plug. I did a compression test on the top cylinder and got 60 pounds then I did a compression test on the bottom cylinder and got 157 pounds. I also noted the top spark plug was very clean and the bottom plug was black the way most plugs are after a while of use. I am almost sure the water is comming from the cylinder. Can someone give me some Idea of the problem and how much it will run to fix it my self?????????<br /><br />I can not beleve the old man shaffed me, How could he have not known?<br /><br /> I am so in the dog house.