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    1975 6HP Johnson surges

    When I try to troll with my 6hp Johnson it runs fine for about 15 minutes and then drops from trolling speed to a slow smooth idle, then will rev up all by itself. I tightened sloppy throttle linkage to no avail. It is almost as if one cylinder drops out and then kicks back in but the idle is...
  2. R

    9.8 intermittent spark

    I have a 1975 Merc 110 9.8 HP. One cylinder fires intermittently or not at all at low speed but seems to fire at high speed. I have heard of coils breaking down under a load but not vice versa. Any ideas? This is the breakerless ingnition system. I have a spark tester so I can actually see...
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