1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 43Get this manual
Stop the engineTo adjust, turn thescrew or out as necessary to correct the tlmmgTurning the screw clockwise advances the timing, while turning the screw counterclockwise retards the timing
5Repeat Steps thru 4This procedure should provide the best idle characteristics while allowing engine idle speeds in gear ranging from 600 to 700 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 RPM Maximum Spark Advance Run the engine with the proper test wheelDo not run the engine with propeller or flush adapter for the adjustment1Connect timing light to the No1 cylinder