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

I have an older Evinrude 4hp outboard, which is running but seems to get pretty blackened. I'm running it on 25:1 mix (petrol: marine 2-stroke outboard oil) at present.

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  • Anonymous Mar 27, 2014

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The proper mix is 50 to 1 or 16 oz to every 6 gallons,in my little boat I put 4 quarts in the 48 gal tank and its been running for 22 years,your running way to rich and your plug is probaly fouled,take it out clean it up/dump your fuel and mix it right,thats a great motor you got,I hunted with it for years,oh yeah when you get started run it till all the smoke is gone or you will have carb problems ,if you dont have them all ready,a little carb cleaner wont hurt but get it running first,or all that trash will foul you out,have a great trip bartriley1

Posted on Jan 05, 2009

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Hi, I just bought a 1986 outboard boat , Evinrude 60HP , what kind of oil should i be mix ( how to mix ) to get starting , is the NGK spark plug B9HS right to use for this motor ? it look new .

Posted on May 26, 2010

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Posted on Jan 02, 2017

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1 Answer

2003 2 stroke evinrude 225 hp outboard will run at high speed about 5-7 min than starts shaking seems like not all cylinders are firing. if i shut off the motor and restart it will run another 5 min.


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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
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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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Where can I download a free manual for Evinrude 4HP motor.


Adampeake how do you download free from the web link
they wanted $19.99USD

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