1975 Evinrude 40 HP Outboards Service Repair Manual, PN 5093, Page 36Get this manual

1975 Evinrude 40 HP Outboards Service Repair Manual, PN 5093, Page 36

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Before installing the plug, be sure the plug seat in the cylinder head is clean and free from obstructionsSee Figure 4-19 Screw the plug in by hand, then tighten to the specified 17-12 to 20-1 foot-po