2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 121Get this manual
IGNITION IGNITION SYSTEM TESTS
IGNITION SYSTEM TESTS
CAUTION All cranking output tests must be performed with spark plugs installed and torqued in the cylinder headIf necessary to remove the spark plugs, be sure to keep the spark tester away from open spark plug holesThe following series of steps will systematically isolate problem area in the ignition systemTo reduce your troubleshooting time and to avoid incomplete results, perform these steps in the order written
If equipped, install the clip onto the emergency stop switchCrank the engineSpark should jump each tester gap alternately If tester shows good output on both cylinders, go to Power Pack Running Output on p125 If tester shows good output on one cylinder, go to Power Pack Cranking Output on p124 If tester shows no output, go to Stop Circuit Tests
IMPORTANT: It 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 the following: Coil primary wire routing Spark plug lead routing Flywheel condition and location Synchronization and linkage adjustments