1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 112Get this manual
Indexing Flywheel, Erratic Ignition 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 revolution1Disconnect the spark plug leads and remove all spark plugs
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 No2 piston is near top dead center
3Mark on the flywheel rim, directly across from the timing pointerLabel this mark "No.2
labeling the marks with the correct cylinder number