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  1. M

    Drive shaft housing temperature?

    I've got a 7.5 merc and recently fixed a problem with the cooling. It now seems to work, but I am a little surprised that the drive shaft housing gets warm. Is this normal? It is not really hot. I can put my hand on it for a short while, but I can't hold it there for a longer time. The tell...
  2. M

    Coil marking and CDI wireing (merc7.5)

    I changed the coils around in order to find out if one of them were broken (which was the case). However, I didn't pay attention to that the coils were marked + and -. Does anyone know which wire goes where? The wires colors are quite faded, but I think there is one green, one green with a white...
  3. M

    Hot, but cooling works

    I have a merc 7.5 -84 that gets hot, but the cooling system seem to work since there is water coming out the pee-hole. The enginge seem to run well, but I noticed that it smelled. It is the drive-shaft housing that is hot, too hot to hold your hand on it. Touching the motorblock close to the...
  4. M

    What is in the CDI (switch) box?

    I have an Mercury 7.5 and suspect that I have an faulty CDI box. Is there anyway to test it? I am surprised that there is only one triggersensor. How does it know which cylinder to fire? I have sparks on both plugs. Can the CDI box break so that teh timing is wrong? Does anyone have circuit...
  5. M

    Merc 7.5 - only one cylinder running

    I have a Mercury 7.5 (-84) that only runs on one cylinder. It always starts and runs quite well, even though it is weak. I have noticed that if I remove the cable from the top-plug it runs as usual, but removing the bottom one makes it impossible to start. I can see that both plugs have sparks...
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