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    88 merc 20hp - not firing 1 cylinder

    Ok guys. Lets start with both coils are fine. top cylinder fires fine bottom cylinder doesnt fire. I have spark in both. Swich box? Trigger? How do i test each, i really need to know how to test them. (I swaped both coils around and still only top cylinder firing) (spark tester on each...
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    1971 Fastwin 18hp - Missing cylinder

    At WOT the motor seems to run good on both cylinders, but when i drop down to trolling speed it drops a cylinder. I also noticed afterwards there was black oil leaking out of a weep hole in the lower unit. Im assuming i am running really rich. Would running rich cause the cylinder drop or...
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    1990 20hp Merc - Intermittent Cylinder

    1990 20hp Merc Tiller- It will run on one cylinder religiously but will intermittently hit on two probably 3-5% of running time. What could be causing this? Where to Start?
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    Mercury 1988 20hp One Cylinder Two Intermittently

    All, I need some advice - 1988 Mercury 20 HP tiller. The issue the engine routinely runs on only 1 cylinder, when going across the lake it will intermittently hit on two for anywhere from 2 seconds to a Minuet, then drop back to only 1 cylinder, there is no pattern to it, some days it will...
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