1993 Johnson Evinrude "ET" 40 thru 55 Service Manual, P/N 508283, Page 125Get 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 plugsrl 2Place the eraser end of pencil in the No.2 spark plug holeSlowly turn the flywheel by hand clockwise, until the greatest length of the pencil is outside the spark plug holeThis indicates the No.2 piston is near top dead center