Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 10Get this manual

Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 10

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MODELS 2.5-3.0 (1991 and later)
Idle Speed Adjustment
With engine running, position throttle lever to slowest speedAdjust the idle speed screw to obtain recommended idle speed (see "Specif