1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 43Get this manual
4Stop the engineTo adjust, turn the adjustment screw in or out, as necessary, to correct the timingTurning the screw clockwise advances the timing, while turning the screw counterclockwise retards the timing5Repeat Steps thru 4& INote This procedure should provide the best idle characteristics
while allowing engine idle speeds in gear ranging from 750 to 850 RPM, depending on propeller selection If idle speed is too high, check induction system for air leaks If idle speed is too low when engine condition is correct, decrease idle timing to achieve desired RPMExample: from ATDC to ATDC If idle speed is inconsistent or the engine runs rough or spits lean, refer to Carburetor Mixture Adjustment, Section 2Maximum Spark Advance
INote Run the engine with the proper test wheelDo not run the