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  1. C

    2009 mercury 20hp 4 stroke low speed adjustment screw

    The carburetor in the service manual does not show the low speed adjustment screw nor does it give any information as to how to correctly set this. The screw is hiding behind a little aluminum cap located in the upper left corner of the carb (if you are looking at a side view of the carb). I...
  2. C

    2009 Merc 4 stroke 20hp--engine bogs at half throttle and above--otherwise runs perfect

    I have this Merc that is seemingly unfixable. The unit bogs once I get about half throttle and above. I have the service manual and have checked everything for proper pressures in the fuel system and its related parts. I have had the carburetor ultrasonic cleaned...I have replace...
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