1983 Johnson/Evinrude 2 thru V-6 outboards Service Repair Manual P/N 393765, Page 34Get this manual
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Specifications9.9, and 15
Ignition Co il Test Spec ifications Stevens Model ST-75 Reverse Polarity (Switch Setting CD) Stevens Tester Model M.A75 or M.A80 Switch -A Index Adjustment 20 1.