1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 57Get this manual

1974 Johnson 40 HP Outboard Motors Service Repair manual P/N JM-7407, Page 57

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For the first to 10 minutes, operate engine at fast idleCheck operation of water pump and motor temperature frequentlyFor remainder of first hour, do not operate engine over 3000 rpm (approximate) or

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