I have a 1988 evinrude 6 hp that calls for 100/1 mixture right on the cowling.
50:1
No. Four stroke engines get lubrication from a separate oil reservoir.
The formula is ((gallons of gas x 128) / mix ratio) or ((4 x 128) / 40). The true answer is 12.8 ounces for you, but if you were to put 13 ounces of oil in because measuring tenths of an ounce is hard to do, it would be okay.
The 4 hp Evinrude, model 4904D, was manufactured in 1979.
An Evinrude model E4RDHSR would be a 2004, 4 hp.
The fuel to oil ratio for the 1987 model, 4 hp Force outboard would be 50:1, or roughly, one pint of 2 cycle oil, to six gallons of fuel.
1949 - 5.4 HP Evinrude Zephyr (2-stroke, 4-cylinder)
Honda only manufactures 4 stroke outboards, therefore no oil is required in the fuel.
A 4hp Mercury outboard requires a 50:1 fuel to 2 cycle oil mix.
they usually hold about 1 to 1.5 gallons of gas/oil mix
part before hyphen is model number for 1969 4 hp.
Unleaded....mixture is 50:1 with 2cycle oil in 2 a stroke engine. 4 strokes do not require you to mix fuel