1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 88Get this manual
Output Tests &
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
STEPTOTAL OUTPUT TEST
To avoid electrical shock, do not handle ignition coil or spark tester during cranking tests1Twist and remove all spark plug leads
2Adjust the gap on the spark tester to 38 in(9 mm)Connect tester leads to the spark plug leadsSecure tester clip to clean engine ground
INote 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 simultaneously If tester shows good output on both cylinders, go to STEPRUNNING OUTPUT TEST If tester shows good output on one cylinder, test ignition coil as described in Ignition Coil Test, this section If tester shows no output, go to STEPSTOP CIRCUIT TEST