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  1. H

    Stumped! DF140 stumbles after running at WOT for few minutes

    yt video of issue
  2. H

    Stumped! DF140 stumbles after running at WOT for few minutes

  3. H

    Stumped! DF140 stumbles after running at WOT for few minutes

  4. H

    Stumped! DF140 stumbles after running at WOT for few minutes

  5. H

    Stumped! DF140 stumbles after running at WOT for few minutes

    Engines are 2020 DF140s, one counter-rotating on a 22' seacat. 200 hours on engines.
  6. H

    Stumped! DF140 stumbles after running at WOT for few minutes

    When cold the port engine will start and run through all RPM ranges up to WOT normally. It will run at 4200-ish for long periods of time (tested up to an hour) with no issues. The issues occurs after 3-5 minutes of running at WOT. The engine will begin to stumble and surge, dropping RPMs down...
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