1996 Johnson Evinrude "ED" 9.9 thru 30 2-Cylinder Service Repair Manual, P/N 507122, Page 122Get this manual
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IGNITION OUTPUT TESTSCD II
[!] 1 Twist and remove the leads from both spark plugsr:;l 2 Adjust the gap on the spark tester to 112 in(12 mm)Connect tester leads to the spark plug leadsSecure test