1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 27Get this manual
High Performance Any recreational engine, when used for high performance, requires 50: fueloil mixtureSevere Service The fueloil ratio for recreational models is 50: (2 oil) when used In commercial, rental, or extended severe serviceModels equipped with the optional AccuMix system will require 100:1 (1 oil) fuel oil mixture in the fuel tank in addition to the lubrication supplied by the AccuMix system, when used in high performance or severe service applicationsFuelOil Mixing Instructions INotel To be used if engine 's system is not desired or AccuMix automatic oiling
Gasoline is extremely flammable and highly explosive under certain conditionsAlways stop engine and do not smoke or allow open flames or spark near the boat when refueling or changing fuel tanksAlways mix in well ventilated area
Portable tankPour approximately gallon (4 litres) gasoline into tank and add required lubricant Replace filler cap securelyThoroughly mix by shaking tank Add balance of gasoline