1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 118Get this manual
Indexing Flywheel, Erratic Ignition Internal power pack 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
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 No.2 piston is near top dead center3Mark the flywheel rim, directly across from the timing pointerLabel this mark "No2"
4Repeat Steps and for each of the remaining cylinders, labeling the marks with the correct cylinder number5Install the spark plugs and spark plug leadsStart the engine in test tank and run the engine at the RPM where the problem exists6Carefully hook an induction timing light to each cylinder, alternatelyThe timing light should indicate that cylinder's number only, and the number should only appear near the timing pointer The timing light should indicate that cylinder's number only, and the number should only appear near the timing pointer If another cylinder's number appears or the correct number appears more than once per revolution, verify wire and pin location on all timer base and power pack connectors, or replace the power pack