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Outboard Fuel/oil Mix Ratio?


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#1 JD DANNELS OFFLINE  

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Posted July 16, 2013 - 12:42 PM

My son has a nice little  1965 Sears 7.5 hp Ted Williams outboard for his 14 ft jonboat. He has not used it for a couple years and has been running the 15 hp Evenrude. There are still some lakes under 1000 acres in the state that limit HP.

He wants to use the Sears this weekend but has forgotten the fuel/oil ratio. So have I?

I want to say 36:1 or 50:1 ? Any one know what the ratio should be?


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#2 lyall ONLINE  

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Posted July 16, 2013 - 01:21 PM

JD Dannels

 

I did a google search for outboard motor oil mixture and found this site

http://www.ask.com/q...tor-oil-mixture

 

the site states 50:1 - but I would try 36:1

some older one were 24:1

it also depend on the spark plug

using 36:1 you might have to clean the plug sooner - but you know that it is getting oil

 

you should also use regular unleaded gas 


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#3 JDBrian OFFLINE  

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Posted July 16, 2013 - 04:49 PM

In 1965 it would have been a pretty rich mixture if memory serves. I'd try 36:1 to be safe. 


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#4 ghack OFFLINE  

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Posted July 16, 2013 - 06:34 PM

it's more oil dependent than engine dependent go by the oil. Former dirt biker some of the new oils if ran at the old mix ratios will fowl plugs  in short order and run like crap.


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#5 John@Reliable OFFLINE  

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Posted July 16, 2013 - 07:48 PM

What about using a Universal Mix 2 stroke oil, covers them all :thumbs:

 

P.S. It's all I use anymore, sick of running out of 50:1 but plenty of 40:1 :poke:

 

oilmix.jpg


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#6 LilysDad ONLINE  

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Posted July 16, 2013 - 08:01 PM

Don't water cooled outboards use a different oil/mix than yard tools?


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#7 larryd OFFLINE  

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Posted July 16, 2013 - 08:49 PM

My brother told me 36:1

 

larryd


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#8 HydroHarold OFFLINE  

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Posted July 19, 2013 - 12:43 AM

What about using a Universal Mix 2 stroke oil, covers them all :thumbs:

 

P.S. It's all I use anymore, sick of running out of 50:1 but plenty of 40:1 :poke:

 

attachicon.gifoilmix.jpg

 

I tried that "Optilube" single mix in my Ryobi tiller/trimmer.  I normally uses 32:1 and that Opti **** mix nearly burned up the engine.  I'm back to straight Stihl oil mixes  @ mfg'er's ratios.  The older outboards and some older saws used to operate on certain grades of motor oil also, but that's stretching the carbon factor plenty.






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