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Recent content by Ian Short

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    1985 Mercury 35hp Surging under load

    Just for reference, this did turn out to be a small crack in the water jacket expanding when water pressure and heat do their thing; a new powerhead fixed the issue.
  2. I

    1985 Mercury 35hp Surging under load

    Hello, I have a Mercury 35hp that has stumped me for 6 months. Sometimes it will run for 30 mins before surging at about 4000 rpm and up when accelerating, sometimes it will do it instantly. It must be under load as it will run perfectly in a test tank. When having the issue, it seems as if one...
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