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  1. R

    Mercury 150 4 Stroke running rough

    Well, i will be running down the river and after about an hour the motor will start shaking. just had the boat serviced. I'm thinking it is either the popper valve or the thermostats.
  2. R

    Mercury 150 4 Stroke running rough

    I failed to mention the tell tale seems to be putting out water just fine.
  3. R

    Mercury 150 4 Stroke running rough

    Hello All, I have a Mercury 150 4 stroke outboard. The motor runs fine for about an hour, then starts running rough. However, it will run fine when at idle speed. No idea on what it could be. Any help would be greatly appreciated.
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