1992 Johnson Evinrude "EN" 40 thru 55 Service Repair Manual, P/N 508143, Page 28Get this manual
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Fuel Requirements Minimum Octane Models 40RS, 45,55 40, 48, 50 Recommendations See fuel classifications below See fuel classifications below (R+M)2 "AKI" 67 87 "RON" 69 90
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