stihl fuel mix ratio??

Anonymous-0 · May 10, 2012

hey folks,
this just came up the other day but I can't remember which thread it was in....
Stihl calls for 50:1 .... Couple of other things I have take 40:1.... Can't run them on the 50, but will the stihl do OK on the 40:1?? Anyone doing it enough to see any noticeable problems??

Thanks, Dave

Chuck (CA) · May 10, 2012

Had the same question years ago when I bought my Stihl. I was told that the 40:1 would work fine, and 12 years later, still mo problem

Chuck (CA) · May 10, 2012

no, not mo

Anonymous-0 · May 10, 2012

Thanks!

Anonymous-0 · May 10, 2012

When I bought my first new Stihl saw dealer told me about Opti-2. Thats been 8 years ago and use it in all my 2 cycle engines. One mix covers all 2 cycle engines no need for 3 or 4 differant gas cans. Engines run great on it with little smoke and doesn't stink like oil mixtures and no plug fouling.

Wayne in MN · May 10, 2012

Opti-2 is great; it can be mixed at most any ratio even 100:1.
I have used it in Lawn Boy mowers & several string trimmers of various brands.

641Dave · May 10, 2012

Doesn't 50:1 have more oil than 40:1?

Anonymous-0 · May 10, 2012

I'm confused now (not that it's anything new).... One says opti-2 and one size fits all and one says mix it in any ratio...... Is it just an oil or something different?

Thanks...

Kirk Grau · May 10, 2012

I will echo the recommendation for Opti-2. I like only having to have one can of mixed gas to keep track of. Been using it for 8+ years with no problems so far.

Kirk

Anonymous-0 · May 10, 2012

(quoted from post at 12:50:55 05/10/12) I will echo the recommendation for Opti-2. I like only having to have one can of mixed gas to keep track of. Been using it for 8+ years with no problems so far.

Kirk

OK, break it down for an ignant guy.... What's opti2... tried a search here but didn't find anything yet.... Am I looking for an oil or a fuel mixture.....??

Kirk Grau · May 10, 2012

Here is link to some on Amazon. Don't remember what I paid for the last container I bought so can't speak to the pricing at all.

~Kirk
Opti 2 on Amazon

glennster · May 10, 2012

i run various 2 cycle machines, the stihl saws and trimmer run 40-1 and 50-1, and a few others run 32-1. i run 32-1 mix for all the engines and use premium fuel. never had any problems.

Anonymous-0 · May 10, 2012

Thanks!!! That looks pretty dummy proof...

farmer boy · May 10, 2012

No. If you were to mix it 1:1 it would be 1 unit of oil with 1 unit of gas. 40:1 would be 40 units of gas with 1 unit of oil or for actual measurements, 10 litres of gas with 200 ml oil for 50:1

VADAVE · May 10, 2012

YES that's all I run my stuff on--40:1.
In additon to new Stihl's I have a early 80's 029 or 028 and the motor runs better the the rest of it. The ignition has failed once and been updated; the started dogs have failed often enough that they flat stopped working because nothing is there so I goldberg'ed a setup that gets the started working. When that goes I'm betting the motor'll be fine but I'll have to scrap it cause I can't get it started.
I do attribute the health of the cylinder and rings to running the heavier mix.

Anonymous-0 · May 10, 2012

dave2 I buy Opti-2 in a 34 fl.oz.container ( It mixes 25 u.s. gallons). The container has a measurer on the side of it for a 1 gal. or 2 gal. mix. It also contains a fuel stabilizer. I bought my last container about a year ago and gave around $15.00. They also make it in pouch that will do a 1 gallon mix but cost more than buying it in large container.

Mark6005 · May 10, 2012

Stihl now has their own premix i was told with my new saw
purchase. A little expensive don"t remember exactly how much
but it has a 2 year shelf life. Seems it came in quarts on up to
meet occasional users needs. Works with trimmers ,saws and
I imagine all other stihl products. Me, I"ll do 40-50 to 1 like
mentioned and cover all the bases. I"m getting good at one
Mississippi two Mississippi when measuring.

Mike (WA) · May 10, 2012

I inquired here awhile back, because I have a 1954 Johnson Sea Horse outboard motor, that wants 16:1 mix. Opinions here were delightfully diverse, from- everything should get what the manual says, to everything should get 40:1, to everything should get 50:1.

Seemed like everyone here was kind of freestylin', so I went to the antique outboard board. Much more consistent there- they said anything later than 1980 or so would probably do fine on 40:1, or 50:1 if specs for that application called for it, but older stuff you should stay with the recommendation in the owner's manual, because materials were not as sophisticated then. Most everyone agreed that 50:1 in an old outboard was only indicated if you had a good set of oars with you.

504 · May 10, 2012

New Echo manual says to run 50to1 in any Echo product, no matter what was recommended when it was
new.(With Echo brand oil) and that's what I run in everything.

Wheat Farmer · May 10, 2012

My Stihl at 9000' elev has to be NO MORE than 40:1, I even mixed it a bit less. Still running after 15 years.

Anonymous-0 · May 10, 2012

Years ago had old outboards with the six gallon tanks. If I
remember it was 16:1 for omc and I imagine merc Was the
same.

RodinNS · May 10, 2012

I would adhere pretty close to the 50:1 standard. We used more oil until a few years ago... and constantly battled saws and trimmers with gummed up carbs and sooted spark arrestors. With the emission junk on the saws today I think you better stay with the lean oil mix. They work better on it and last just fine.
Also make a point of using the Stihl or equivelant spec oil rather than just any old mix oil....

Rod

Anonymous-0 · May 10, 2012

You may void your warranty with 40.1, is it so difficult to keep a separate container for 50.1.
There must be a reason why the manufacturers specify this.... probably so the buyer can alter,blow it up then place a rant on here..

George Mcpherson · May 10, 2012

We have always used Ams/oil 100:1 blend when we have gone to the wood. We have had Stihl, Sach Dolmar, and McCulloch and all ask for different mixes and we use the same can of 100:1 which has more protection than others. As a matter of fact we use it in the 4 cycle splitter engine too. Never had a problem on anything in 40 years. Look it up online. Love the stuff. I just mixed some today for the saws and leaf blower.

Anonymous-0 · May 10, 2012

No. it has the same amount of oil [1] but the 50.1 is a bigger dilution, so you could say with the 40.1 more oil would be going into the cylinder with the petrol.

JDseller · May 10, 2012

Dave just buy a good ash less two cycle oil and mix it for the lowest ratio machine you have. Example 40-1. You can then run this in the machines that state 50-1 or 60-1 and they will just be getting a little more oil.

I have mixed all of mine at 32-1 for the last ten years or so and had ZERO problems. I sometimes use my chainsaws hard in the summer. When it is hot you have to lean the carb. mixture adjustment down to keep from fouling plugs as much. So your engine is using less fuel for the same RPMs compared to cold weather. I had a chainsaw lock a piston to the jug in the summer. The repair guy told me to think about the fuel/oil ratio. When you have them running leaner they are getting less oil. So I started using 32-1 ratio and have not had anymore failures.

Anonymous-0 · May 11, 2012

I didn't know it'd make so much difference (cause I B ignant sometimes)..... But have a weadeater blower that takes 40:1... Always started right up and blew, but after a minute or so would start slowin and hard to keep running....
I took some 50:1 and put a little extra oil in it and tried it yesterday (after I read 40:1 on the cap :roll: ) and tried it.... Ran like a stripedassed ape.....
I've gotb a backpack motor brushcutter that was doing the same as the blower... Bet I get it out and find 40:1 or lower on the cap.....
I'll go with the 40:1 mix then......

Thanks folks.....

Jon Hagen · May 11, 2012

If you use an oil /gas mix with more oil than recommended, make sure you use a premium gas.

I have one of those little 900 watt 2 cycle generators sold by harbor Freight. If I get the oil mix a bit stronger than the recommended 50/1, it lowers the fuel octane enough so the engine detonates when using regular gas.
Get it right on the 50/1 mix and it is OK.

stihl fuel mix ratio??

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