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  1. C

    Mariner 6

    Mariner 6 (twin) year 1990-1994, not firing on upper cylinder, lower fires OK. Compression good on both. Fuel through to both. New plugs - combustion signs clear on lower but upper is totally clean - no combustion. Ignition coils swapped without effect (fault remains on upper cyl). Plug leads...
  2. C

    Mariner Six hp - upper cyl probs?

    Any suggestions would be very much appreciated concerning my Mariner (mercury) six, twin cyl circa 1993. Runs rough.... disconnect upper plug lead - no difference. Disconnect lower plug lead - stalls. It will start and run without the upper plug installed (unevenly obviously) and I can see...
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