1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 119Get 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 all spark plugs
L!J 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 top dead center
rl 2Place the eraser end of pencil in the No.2 spark plug hole