1978 Johnson 55 HP Outboards Service Repair Manual P/N 506997, Page 42Get this manual

1978 Johnson 55 HP Outboards Service Repair Manual P/N 506997, Page 42

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bAdjust the air gap of the spark tester to 12 inch (12 mm) and connect the tester leads to the high tension leadsSecure the other end of the spark tester to clean engine groundSee Figure 4-14 1 Four w