1980 Johnson 4HP Service Repair Manual P/N JM-8004, Page 14Get this manual

1980 Johnson 4HP Service Repair Manual P/N JM-8004, Page 14

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ENGINE FUEL AND LUBRICANT RECOMMENOEO GASOLINE: Use gasoline with the following minimum octane numbersPUMP POSTEO OCTANE NUMBER Research Octane Number Most Commonly Used in the Past 86 91
FUEL M