1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 141Get this manual
Indexing Flywheel, Erratic Ignition AU Models Internal power pack problems could cause power pack 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 revolution
1Disconnect the high tension leads and remove all spark plugs12812Place the eraser end of pencil in the No.2 spark plug hole and slowly turn the flywheel by hand in clockwise direction until the greatest length of the pencil is outside the spark plug holeThis indicates the No.2 piston is near TDC29 r3Make mark on the flywheel rim directly across from the timing pointerLabel this mark, "No2