1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 35Get this manual

1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 35

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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

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