1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 32Get this manual

1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 32

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SPARK PLUGS Spark plugs having the proper heat range are very important for peak operation of the motorThis motor is designed to operate with Champion UL4J spark plugsSpark plugs are classified accord

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