1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Repair Manual, P/N 507870, Page 106Get this manual

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ill plugs installed and torqued in the cylinder headIf neces-
STEPTOTAL OUTPUT TEST
Twist and remove the spark plug leads from both spark L!J plugsf21 2 Adjust the gap on the spark tester

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