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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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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.


check the plugs if they wet its getting too much oil in the mix. if dry and black plugs then it could be not enough oil or fuel in mix.

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I have a 20 hp mercury outboard serial#06082001.I want to know what year it is and if it's 2 or 4 stroke


If you drop the first zero it would put it at 1981.

http://www.themarinedoctor.com/msn.pdf

this site gives a different answer, as 1980- 81, so close. It SUGGESTS it is a 4 stroke engine.

http://www.boats.net/parts/search/Merc2/Mercury/25%20%282%20CYL.%29%282-STROKE%29%28International%29/parts.html

It is likely a 4 stroke, but I won't give you a definitive answer, due to the damage it can cause with a guess!

A four stroke running with two stroke oil will just smoke, but a two stroke with no oil will seize and leave you stranded on the water with a seized engine!

A four stroke engine has valves operated by push rods or a pulley and a chain, a two stroke just has a head. Take a look at the engine and it should be obvious.

For your first service, I would suggest you go to a marine engineer. Ask all the questions, and get the right answers. When I had my 1986 Evinrude serviced, i typed a list of questions and left the list with him. i asked him when I picked up the boat and wrote the answers down. The first one was 'petrol to oil ratio and which is the best oil'. A basic service will cost you a hundred bucks and you will have some comfort that you are unlikely to break down, 6 miles offshore with only a paddle :)

https://www.google.ca/search?q=20+hp+mercury+outboard+serial%2306082001&ie=utf-8&oe=utf-8&gws_rd=cr&ei=uwm-WKjHK6SUjwSApJLQBw#q=mercury+outboard+serial+number+lookup&*

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1 Answer

I have a 2013 evinrude etec 25 hp. It has only had less than 2 tanks of fuel ran through it. I took it out today and it would start but wouldn't stay running.


This is a 2 stroke engine - an outboard motor?

Two strokes are quite robust. The usual mistake people make with these engines (think of chainsaws, lawn mowers and hedge strimmers..) is to use car engine oil instead of the correct two stroke oil. Motor oil is completely incorrect and fouls the spark plug.

The other fault is to mix fuel and two stroke oil in the wrong ratio. Most chainsaws etc .. use a mix of 25:1 Too much oil causes oiling and misfiring of the plug. Too little oil causes excessive and fast wear.

Your engine starts up. That tends to suggest that everything is working ok up to a point.

However, look on the following link which deals with an overheating problem for that engine:

http://www.etecownersgroup.com/post/25hp-etec-problem-6107593

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1 Answer

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
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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

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Evinrude outboards


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.

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120 evinrude 2 stroke runs rich


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