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    1994 mercury 40 hp 4 cylinder High speed miss on #3 cylinder

    I have a 40 hp mercury that misses on #3 cylinder only when ran over 4000 rpms. Below that it runs fine. Pulled the plugs after running and #3 appears fouled. The compressions are all between 1 or 2 psi of each other at about 110 psi. I have replaced the plugs, wires, coils, and rebuilt the...
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    1994 40 hp mercury top carburetor not priming, hard start when cold.

    I have had this 40 hp mercury on a pontoon boat for two years, it runs great, good idle, good acceleration and wot. It is always hard to start when cold. It starts good when warm. I have checked the fuel primer valve and it seems to work fine electrically and manually. I have clear 1/8 in. fuel...
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    1994 40 hp Mercury 2 stroke 4 cylinder drops # 1 and # 2 cylinders at idle.

    I have a 1994 40 hp Mercury 2 stroke that runs good at all speeds but drops the #1 and #2 cylinders at idle. I switched 1 and 2 coils for 3 and 4 coils and still 1 and 2 quit firing at idle which makes it hard to start. So the coils are good. Where the stator connects to the switch box I swapped...
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    loose main harness 8 pin connection

    What is the best way to tighten the 8 pin connecton on my 40 hp mercury. The motor will start most of the time but sometimes it will not. I checked the starting system with my volt meter and when I touched the 8 pin connector with the key on the warning horn would go off and back on. I pulled...
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    1994 mercury 40 hp fuse blown

    I have a 40 hp mercury on an 18 ft. bass buggy pontoon. I bought it after been sitting up for several years. I got the motor up and running but evertime I push the ignition switch in to choke it blows the 20 amp fuse on the motor. I have a wiring diagram for the motor but not for the boat under...
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    1994 mercury 40 hp prop pitch?

    I have a 1994 mercury 40 hp on a 18 ft. sun tracker pontoon boat that I bought at a garage sale. The prop is bent up and i think it is a 9 in. pitch. I am in the process of getting the boat ready for the summer and would like to know if anyone has this type setup and what pitch prop would you...
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    1994 40 hp mercury oil injection

    I am in the process of disconnecting the oil injection on this engine and I am looking for the block off plate. Does anyone know if such a thing exist for this engine. Also the correct procedure for disconnecting this sytem. I bought this motor and pontoon boat last summer and I am in the...
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