1976 Evinrude 9.9 HP Service Repair Manual Genuine Models P/N 5188, Page 13Get this manual
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ENGINE FUEL AND LUBRICANT RECOMMENDED GASOLINE: Use gasoline with the foHowing minimum octane numbersPUMP POSTED
FUEL MIXTURE part Lubricant to 50 parts Gasoline OR: (6 GalTank) pint lubricant t