1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 51Get this manual
Maximum Spark Advance
INote Run the engine with the correct test propellerDo not run
the engine with regular propeller or flushing adapter for this adjustment1Connect timing light to the No.1 spark plug leadMark the flywheel timing grid at 19 BTDC2Start the engine and allow it to reach normal operating temperature3Run the engine at no less than 5000 RPM in FORWARD gearThe engine's timing pointer must align with 19 BTDC on flywheel's timing grid
4Stop the engine to prevent contact with rotating partsAdjust the length of the spark control rodif necessary, by removing the forward socket from spark lever
Rotate the socket in clockwise direction to advance timing or in counterclockwise direction to retard timingTwo revolutions equal approximately one degree of timing6Install the spark control rod on the spark leverand verify maximum spark advance following Steps thru 3revolutions, the idle speed adjustment and throttle control rod length must be readjustedRefer to Idle Speed and Throttle Control RodShift Lever Detent Adjustment