1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 129Get this manual
Indexing Flywheel, Erratic Ignition Internal power pack problems or shorted isolation diodes (if equipped) 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 plugsr:;l 2Place the eraser end of pencil in the No.2 spark plug hole LJ 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 TDC
Make mark on the flywheel rim directly across from the timing pointerLabel this mark, "No.2