1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Repair Manual P/N 520204, Page 27Get this manual
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FuelOil Mixing Instructions
100: (1 Lubricant) 50:1 (2 Lubricant) 25: (4 Lubricant)
4 floz(118 ml) floz(236 ml) 16 floz(473 ml)
8 floz(236 ml) 16 floz(473 ml) 32