1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 127Get this manual
IGNITION OUTPUT TESTSCD II 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 holes
INote The following series of steps will systematically isolate a
problem area in the ignition systemTo reduce your troubleshooting time and to avoid incomplete results, perform these steps in the order written
STEPTOTAL OUTPUT TEST
1Twist and remove the leads from both spark plugs
2Adjust the gap on the spark tester to 12 in(12 mm)Connect tester leads to the spark plug leadsSecure tester clip to clean engine groundprevent possible arcing of high voltage, route tester leads at least in(51 mm) from any metal surface