1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 50Get this manual
Maximum Spark Advance Adjustment
INote' the engine with propeller or flushing adapter not run Run the engine with the proper test wheelDo for the
adjustment1Connect timing light to the top cylinder's spark plug lead2Start the engine and allow it to reach normal operating temperatureRun the engine at no less than 5000 RPM in FORWARD with timer base fully advanced3The engine's timing pointer must align with 19 BTDC on flywheel's timing gridMaximum Spark Advance 45, 55
ill partsRemove the spark advance rod Bend rod ends
4Stop the engine to prevent contact with rotating
together to advance timing; bend rod ends apart to retard timing5Install the spark advance rod and recheck timing per steps and 3Wide Open Throttle Stop Adjustment1With the engine not running, advance the throttle control to wide open position