1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 117Get this manual
Indexing Flywheel, Erratic Ignition 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 both spark plugsf1l 2Place the eraser end of pencil in the No.1 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.1 piston is near top dead center3Make mark on the flywheel rim directly across from the timing pointer or starter pivot screwLabel this mark "No1