2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 78Get this manual
IGNITION IGNITION TESTS3.5
IGNITION TESTS3.5
All cranking output tests must be performed with spark plug installed and torqued in the cylinder headIf necessary to remove the spark plug, be sure to keep the spark tester away from spark plug holeThe following series of steps will systematically isolate an ignition problem To reduce your troubleshooting time and to avoid incomplete results, perform these steps in the order written
Results:
If tester indicates good ignition, refer to Power Pack Running Output Test If there is no spark or poor spark, proceed to Stop Circuit TestsIt is possible for the ignition system to have problem but still produce good outputIf the engine "pops" or "backfires" during starting, the ignition may be out of timeCheck flywheel condition and location
Total Output Test
Stop Circuit Tests
CAUTION
Elimination Test
IMPORTANT: To avoid possible shock hazard,
do not handle ignition coil or spark tester during cranking tests Disconnect black lead connector between stop button and power packCrank engine and observe results at spark tester