1979 Johnson 2HP Outboards Service Manual, Page 13Get this manual
ENGINE FUEL AND LUBRICANT
OF GASOLINE: numbersPUMP Use gasoline with the following minimum octane OCTANE NUMBER 86 91
Research Octane Number Most Commonly Used in the Past
Automotive gasolines regular-leaded or lead-free meeting these minioctane numbers used; however, best results will obtained using lead-free gasoline
1 1NOTE _
When operating in any other country than the United States, Canada or Australia, gasoline used which wlll satisfactorily operate an automotive engineLUBRICANT: Use Johnson lubricant which is certified for service(two cycle-water cooled)It is formulated to give best engine performance with least combustion chamber deposits, least piston varnish, maximum spark plug life, and best lubricationSee inside back coverIf Johnson lubricant is not available, another BIA certified