1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 112Get this manual
Output Tests 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 holes
STEPTOTAL OUTPUT TEST
To avoid electrical shock, do not handle ignition coil or spark tester during cranking tests
1Twist and remove all spark plug leads2Adjust the gap on the spark tester to 3B in(9 mm)Connect tester leads to the spark plug leadsSecure tester clip to clean engine ground!Note! To prevent high voltage arc, route tester leads at least in(51 mm) from any metal surface3If equipped, install the clip onto the emergency stop switchCrank the engineSpark should jump each tester gap in sequence4Refer to Troubleshooting Sequence Chart, Page 3-21Start with your specific fault symptom and continue troubleshooting in sequence!Note! 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 Sensor Encoder