1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 120Get this manual
Indexing Flywheel, Erratic Ignition Internal power pack problems could cause 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 both spark plugs
ITJ 2Place the eraser end of pencil in the No1 spark plug W
3Mark on the flywheel rim, directly across from the timing pointer or starter pivot screwLabel this mark "No1"
holeSlowly turn the flywheel by hand, clockwise, until the greatest length of the pencil is outside the spark plug holeThis indicates the No.1 piston is near top dead center
4Repeat Steps and for the No.2 cylinderLabel this mark
" No.2"5Install 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 or starter pivot screw If another cylinder' number appears, or the correct number appears more than once per revolution, verify ignition coil primary lead routing or replace power pack