1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 126Get this manual
IGNITION 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
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 plugs12
rn 2Adjust leadsgapthe spark sparkleadsSecure tester clip to the on the tester to in(12 mm)to plug Connect tester
clean engine ground
INote To
prevent possible arcing of high voltage, route tester leads at least in(51 mm) from any metal surface