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    1989 ish Mercury Force 120 ignition issues

    Thanks for all the help on this. I found a couple of used blue CDI boxes that have corrected my misfire problem. I’m now trying to determine why I still have water droplets on all 4 plugs. Engine seems to still run a bit rough so I’m guessing it’s caused by the water intrusion. This is a...
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    1989 ish Mercury Force 120 ignition issues

    Thanks for all the assistance on this. It’s looking like I need 2 new modules… I called standard magneto and they are not making anymore of the blue modules… I am seriously considering and looking into a change over to the cdm system. Has anyone done this and can anyone provide info for me?
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    1989 ish Mercury Force 120 ignition issues

    Thanks for the quick reply’s. A couple of thoughts from the comments… I will definitely check for intake air leaks and see if I’m sucking air… I definitely don’t want to be running lean and pop something Water on plugs is a mystery as it’s all new gaskets in there already. I will check the head...
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    1989 ish Mercury Force 120 ignition issues

    I am in need of help on my 1989 ish Mercury Force 120. I have ignition issues that I can not seem to properly diagnose. I will go back and give an explanation as to how I got to this point… the point of wanting to smash this thing into many little pieces… The engine ran great for many years and...
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    Lack of power

    Thanks for the troubleshooting guide Puffitu Scott
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    Lack of power

    Hi All I should also mention that it would appear that I have 4 blue coils and 2 CD boxes in this system. Not sure what it’s called but I think it’s the older style system Scott
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    Lack of power

    Hi All Thanks for all the input and suggestions. I have done some more testing and have found an erratic no spark on cyl#2. I used a spark tester at idle and found #2 would have spark and engine running smooth then it would stop sparking and of course engine ran with a miss. I swapped coils...
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    Lack of power

    Thanks. I can take a look at that and see. What’s the base setting for the screws? Thanks Scott
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    Lack of power

    Hi All, I'm hoping someone can help me out. I have a 1991 Merc Force 120 with a erratic lack of power. I'll first mention that this is a new rebuild, new crank, pistons, seals, bearings and gaskets. The engine starts up good and idles fairly decent. While on the water and attempting to...
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    1990 ish crankshaft question

    Hello everyone, Long time reader but first time posting... I have a mercury force 120, same old story of lack of compression due to piston damaged by ring failure. During tear down of engine I found the crankshaft is pitted and in need of re-building or replacing. The issue I'm having is I...
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