1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 59Get this manual
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Maximum Spark Advance- -
screw Adjust the screw as necessary to correct timingOne turn clockwise retards timing about and one turn counterclockwise advances timing about 1 Tighten locknut 5 Run