1976 Johnson Outboard Motor 40 HP Service Repair Manual P/N JM-7609, Page 36Get this manual

1976 Johnson Outboard Motor 40 HP Service Repair Manual P/N JM-7609, Page 36

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Before insta1ling the plug, sure the plug seat in the cylinder head is clean and free from obstructionsSee Figure 4-19 Screw the plug in hand, then tighten to the specified 17-12 to 20-12 foot-poundsI