1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 123Get this manual
Indexing Flywheel, Erratic IgnitionAll Models Internal ignition module problems could cause module to fire erratically or continuouslyTo troubleshoot this situation, you must determine that each cylinder is firing at the correct time and no more than once per revolution1Disconnect the spark plug leads and remove all spark plugs
LJ Slowly turn the flywheel by hand clockwise, until the greatest
f2l 3Mark on the flywheel rim directly across from the timing pointerLabel this mark "No.2"4Install the spark plugs and spark plug leadsStart the engine in test tank and run the engine at the RPM where the problem exists5Carefully hook an induction timing light to each cylinder, alternatelyThe timing light should indicate that cylinder's number only and the number should only appear near the timing pointer