What is the oil to gas ratio in my 4 horse Evinrude< Model # E4BRHCOB Ser # B101702

24/1 is the correct ratio. I certainly wouldn't go 50/1 but you could split the difference with a good synthetic.

1957 Johnson Seahorse QD18 10hp Oil Mixture - Marine ...

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What year/model do you have that's always needed. Then if not available please indicated fuel or motor it depends, one is mixed in gas the fuel, the other has an oiling system No oil in gas hence, 2 Stroke vs 4 Stroke
Hope I helped

91 octane rating ( no e-mix fuels ) and proper outboard oil ( not normal engine oil)
outboard oil has a property that allows the oil residue to stick to the metal bits and helps prevent rust
e-mix fuels absorb moisture and and rusts out steel tanks , destroys rubber components and corrodes aluminium components
the model you have is not listed on any 7.5 hp engine from 1950 to 1958
model number starts at 4434 to 7512 to 7525 in 1958
for a better answer , talk with an evinrude service center who should have a chart listing your motor
units with oil injection are 50: 1 ratio and others are 6 gallons to 1 pint of oil which is around 45:1
I would seek advice from an evinrude service center for the correct fuel to oil ratio for your engine
to mix the fuel , put the oil in first then the flow from the bowser will effectively mix it up to start with
then fit the cap on the tank and shake it up yourself

I found a mixture of sites for the information
one owner of a 1998 25 hp evinrude says that it is a 2 stroke with a fuel mix ratio of 50:1 as 25:1 is a bit smokey
another site says that the recommended octane fuel rating is 87 although it might run better on 91
best advice is to find an evinrude service dealer and get the right information as the later 25 hp units are etec engine which will be 4 strokes

Johnson and Evinrude carbureted 2-stroke outboards since 1964 require a 50:1 fuel to oil mixture (2%) on engines without an automatic oiling system - 6 gallons of gas to 1 pint of outboard oil.

3014 is a three horse 1955 Evinrude Lightwin. 16/1 fuel oil mix, points set at 0.020 and the NGK B6S plugs set at 0.030". 80-90W marine grade gear oil is used in the gearcase. Nice motors!

2 stroke.Fuel/oil ratio is 50/ 1.50 parts fuel,1 part oil.They are a very good reliable motor.Hope this helps

50:1 fuel to oil ratio

Your best bet is ebay for a replacement user manual. Take a look around, you will come across one... For the meantime, gas oil ratio should be 50 parts gas to 1 part oil, i.e. 50:1. General care: Dont go full throttle for any length of time. Cruise of 3/4 throttle... Always flush engine after use in saltwater, including washing down exterior. Keep spark plugs in good order and check prop for fishing line wrapped around in near the prop hub. Otherwise, get a yearly service and have them check the water pump and replace as needed, get it tuned etc and gearbox oil changed.

the fuel to gas ratio should be 50;1 50 parts oil to 1 part fuel