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Fuel mix ratio for 1939 evinrude 3.3hp motor - Boating

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If you use synthetic or newer oils, follow the recommendation of the oil manufacturer.

Being from 1939, a 2 stroke engine would have been designed to run leaded gas and a very unrefined oil that would burn easily in the combustion chamber. Today's gas and oils aren't even close to what they were in 1939.

If you use a synthetic oil, the mfg's recommendation is usually something like 50:1.

Posted on Jul 22, 2010

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What is the fuel to gas ratio for a 7.5 mercury outboard (1975)


Fuel and Gas is the same thing :>)

You mean fuel to oil ratio? 50:1

The 7.5 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.

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Use Evinrude XD50, as it is by far the best and has less fumes.

Evinrude XD 50 2 Cycle Oil 2 stroke

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I have an Evinrude 7.5hp outboard motor.Mod# 8RC1A SN# 0178194. What Year of manufd? How to mix fuel & what octane fuel to use & what oil to use? Help me go fishing, thanks.


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
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I would seek advice from an evinrude service center for the correct fuel to oil ratio for your engine
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I have a 1998 model E25RMECA I NEED TO KNOW WHAT TYPE GAS TO USE IN IT. AND IF IT IS 2 CYCLE OR 4CYCLE.


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
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You should see some smoke haze at starting and during running.

Having run an Evinrude that had had the auto pump disconnected in favour of pre-mixing fuel, I would take the boat to a marine engineer to check the pump and delivery. You know it is pretty disastrous when all the oil is burned out.

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Evinrude year serial number 3014-10340


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What is the correct fuel/oil mix for evinrude 4hp ?


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