1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 102Get this manual

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TIMING, SYNCHRONIZINGADJUSTING
aFast idle screwIdle wire 4 Check fast idle by turning primer knob to full CLOCKWISE positionFast idle speed should be 1500 2000 RPM
90-827242R02 FEBRUARY 20

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