# changing 40:1 to 50:1 gas mix help

seabeckg(western WA)September 9, 2006

I've five gallons of 40:1 for most 2 cycle but when my Husky went down a good friend loaned me his Echo for the last three cord wood trees I need to chunk up. I would NOT change the mix but, he emphasized "the ECHO uses 50:1" and I don't want to go against his wishes..question, taking one gallon of premixed 40:1, how much gas would I have to add to make 50:1?? I KNOW for some of you this right up your alley and any help would be apprediated..ghg

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lonewoof(z7 SC)

5 gal = 640 oz. Divide by 40 = 16 oz. oil. Multiply 16 * 50 =
800 oz. So you need to add 160 oz (1.25 gal) gas.

September 9, 2006 at 5:27PM
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krugger

Quick math in my head says, 1.25 gal. Juat kidding, nice answer lonewoof :)

September 9, 2006 at 6:12PM
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canguy(British Columbia)

That Echo will run just fine on 50:1 with more power and less smoke although I tend to go heavier in my vintage saws because of the wider tolerances. Oil technology has really improved in the last 15 or so years.

September 10, 2006 at 12:39AM
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jonasmtwo(DE, USA)

I guess I'll catch lots of flak for this, but:
In this complicated life, I now have three buildings to store my stuff. A three bay garage, a two story storage building and a metal/post shed for most of the gardening and yard tools. No matter how I try, I cannot remember where each and every item is. I needed an automotive ammeter that I knew was around somewhere and it took me two days to find it. And I'm one of those methodical guys who thinks there should be a place for everything. My neighbor looks with wonder when he comes over to borrow a c clamp and I walk straight to it. He tells me that's not the way it is over at his place.
To get on with this, I really try to simplify storage of needed things. With that in mind, I used one brand and grade of oil for my chain saws and used it in all of them. Even though the container plainly states that this oil (Mercury) could be used for all two cycle engines; when you folks questioned that, I sent them an email and the reply gave lie to their (perhaps old) container label. So: I switched to Husqvarna two stroke (50 to 1) and use it in every two cycle engine including the ones that call for much more oil in the mix. Actually, the lawnmower and other chain saws seem to run better and haven't yet gone to that great junk pile in the sky.
Not only do I use the same brand and mix of oil in everything, I use the same gasoline in everything including the Jonsered saw that calls for hi test.
I have one five gallon can of gasoline, One 2Â½ gallon can of mixed gasoline, one 50 gallon drum of shell diesel oil that I use in all my vehicles. and 1 wife and 1 dog. Needless to say, one wife is all I need (or can put up with) but I could use another dog or two.
What the h___ kind of life if it when we have to spend most of our time screwing around with stuff just to mow the grass, cut down a tree, or to do the most simple things.
My advice to one and all is use the same 50 to 1 oil for everything. It works for me and I'm noted for the antique stuff I still own and use constantly so my philosophy can't be all that bad.
Jonas

September 10, 2006 at 9:53AM
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stashu117

A few years late but you need to add .25 gallons or 32 fluid ounces. Going from 1 over 40 to 1 over 50 you are increasing the denominator by 10 or 25% since the 40 represents the gas you need to add 25% to the gas which brings the total to 1.25 gallons since 1 gallon is already mixed you are just adding .25 gallons.

October 8, 2012 at 11:09PM
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rcmoser

First off I don't borrow other people's expensive equipment. IMO I would just run the 40 to 1 mix. At least it won't lock up or burn up from lack of oil in case you mix it wrong. Another thing IF I had to borrow someones expensive equipment I would buy 1 gallon can and the oil he uses and mix the exact amount required. I wouldn't want to burn up a borrowed saw and have to pay for it. Which may happen anyway cause you dont' know what's been done in the pass??????

October 9, 2012 at 6:52AM
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exmar

Am I the only one that switched to "one size fits all" synthetic two cycle oil? Used to have different gas cans labeled Stihl 50:1, etc. Now I mix a gallon at a time and use in everything, including "vintage." Been doing that for three years and everything is happy. Less smoke, "seems" easier starting and runs better and you go through the "new" gas faster which is important.

LOL, anyone else out there remember the "vintage" Mcculloch's, HOmelites, etc. You bought a can of 30 weight oil, used that in the chain oiler and mixed with gas? Life was simpler I guess-NOT that I want to go back to cutting wood with a 40lb. Mac!!! :-)

Ev

October 10, 2012 at 7:18AM
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RonP_24314(5a 5b)

35.2 oz of gasoline added to 128 oz ( 1 gal.) drawn from 40 to 1 mix

Started with 640 oz ( 5 gal.) gasoline add 16 oz oil total 656 oz mixture. (40 to 1)
Draw 128 oz (1 gal.) of mixture (at 40 to 1) contains 3.2 oz of oil and 124.8 oz of gasoline.
3.2 times 50 equals 160 oz total of gasoline required, currently have 124.8 oz. need to add 35.2 oz gasoline. (Round down to one quart for a slight safety factor)

April 15, 2013 at 1:56PM
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ewalk

Don't be so damm cheap . Buy another gallon of fresh fuel and mix up new oil of the owners preference to his 50:1 Ratio otherwise buy your own saw .

April 15, 2013 at 3:40PM
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andyma_gw

I'm just like Jonas. Except my universal mix is a rich 32:1 . My 50:1 stuff runs fine on it. I would rather risk fouled plugs and exhaust , than scoring a cylinder

April 20, 2013 at 8:16AM
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rustyj14(W/PA)

Don't know about those fancy ratio mixes. We always used a half pint of sae-30 in a gallon of gasoline, and stuff ran forever! Didn't know what "ratio" meant. Thought they just misspelled radio, and ya couldn't hear the radio when the saw was runnin'! RJ

April 28, 2013 at 3:04PM
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