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    90 Merc with intermitent low high rpm

    HI<br /> I've got a Merc 90 s/n 968693 that will sometimes rev to 4000 and other times only go to 3000 sometimes within 15 minutes of each other. It's got new plugs, fuel, filter, filter screen and lines. Idle seems to be a bit rough at times then its OK and smoothes out, no backfire, seems to...
  2. N

    hard start

    Maybe this is a no brainer to most but it is a puzzle to me. 1986 Mercury 90hp power trim runs strong, early in the spring\summer it started great, it took a little coaxing after having sat at the dock for a week at a time, but started none the less. As the summer went on it started getting...
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