Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 30Get this manual

Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 30

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Idle Speed Adjustment Start the engineAfter engine has been warmed upposition throttle lever at the lowest speed position Adjust idle speed screw to obtain recommended idle speed (900-1000 RPM)