Fuel Mixture: Is 25:1 and 32:1 Really Necessary? - Page 2 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #16 of 34 Old 09-28-2018, 08:07 PM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Nah, no warranty to worry about. My old man bought this saw when I was a young whippersnapper riding ships looking for Soviet submarines during the cold war. If my father and his brother couldn't kill this saw, nothing will. And the full synthetic oil in the VP premix didn't hurt it at all. Still rips through some nice sized logs.

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post #17 of 34 Old 09-28-2018, 09:34 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I have 2 gas cans, actually 3 but I'll get to that in a minute... I have a 50:1 can for my Stihl saws using their synth oil and a 40:1 can for the trimmers, blowers and Poulan Pro saws using whatever synth oil I find. If I'm gonna use one of my older saws that take 32:1 I use the 40:1 and just add a little more oil in the tank...

The third can is for old premix from either of the other cans... so the mix varies. I usually get that close to 40:1 or better, add some seafoam or marvel mystery oil and use it up in my beater trimmers or brushing saws... Even if it's old it runs okay to cut brush and I'm not worried if I kill one of those beaters. So far I haven't killed anything.

I don't even know how many saws and trimmers/blowers/etc I have off the top of my head... The shed seems to be full of stuff.

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Old 09-28-2018, 10:03 PM
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Old 09-29-2018, 10:41 AM
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post #18 of 34 Old 09-29-2018, 12:50 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

My buddy was upset, his 1957 Johnson outboard was spewing white grease! Turns out he was using a modern two stroke oil at 16:1 which was mixing with water in the exhaust. He is a stubborn cuss, I couldn't convince him he didn't need to do that anymore. He wasn't happy but settled on 20:1 and lived with the goop spewing into the lake. I ran 50:1 in my old Gale outboard and all my saws with no problem, newest saw is 1986.
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post #19 of 34 Old 10-31-2018, 07:56 PM
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Have to think about the bore x stroke and the carbs tuned to that motor as well as compression. Have an oooold Ryan thats supposed to use leaded gas. No clutch, direct drive. Itty bitty thing thatll out cut near anything made today, we used close to a 12:1 mix in it to help with the unleaded fuel. Ran till we got an easier to start weed eater and the fuel lines rotted off. Been thinking of dragging it out and firing it up again.
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post #20 of 34 Old 04-06-2019, 02:36 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I use 50:1 mix in my 1986 Lawnboy 8480 and it runs perfectly. In fact it runs better than it did with 32:1. I was advised by my lawn equipment repair shop that that is fine. I use Echo oil for it.

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Old 04-10-2019, 05:41 PM
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post #21 of 34 Old 04-10-2019, 10:43 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Cant be straightened out,hopefully kicked out.
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Old 04-10-2019, 11:18 PM
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post #22 of 34 Old 04-11-2019, 07:07 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I've deleted all posts on here that were rude, calling out members, or unnecessary due to the deletion of those posts. Please keep this thread on track, if you don't have any information that gives the OP answers to the question please find another thread that you can add good info to. Keep it friendly folks!

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post #23 of 34 Old 04-11-2019, 09:13 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Quote:
Originally Posted by robhay2 View Post
Modern universal mixture oils are refined to lubricate extremely well, even at 50:1 mixture ratio. Try a good oil like echo power blend or stihl HP ultra mixed at 50:1 in your older equipment and see if it runs normally, and does not overheat. I use the stihl in everything, most is 50:1, but I have a small cultivator that is 40:1 and it runs great, does not overheat.
By the time you find out the mixture is not right the engine will be ruined. No just seeing if it is over heating then you can go back to the designated mixture.

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post #24 of 34 Old 04-11-2019, 12:22 PM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

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By the time you find out the mixture is not right the engine will be ruined. No just seeing if it is over heating then you can go back to the designated mixture.

Walt Conner
Like I said, if my father and his brother couldn't kill it using plain old SAE 30 automotive oil for years, nothing will hurt that saw. I believe that saw will most likely survive a nuclear blast (Homelite XL-12).

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post #25 of 34 Old 04-11-2019, 01:05 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

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Like I said, if my father and his brother couldn't kill it using plain old SAE 30 automotive oil for years, nothing will hurt that saw. I believe that saw will most likely survive a nuclear blast (Homelite XL-12).
What does that have to do with my post?

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post #26 of 34 Old 04-11-2019, 05:46 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

Just something to keep in mind before changing up the mixture on your old 16:1 and 20:1 mixture machines.

These rich mixtures were for engines with babbit rod bearings, prior to the use of needle rod bearings in 2 stroke engines.

I learned this from a Johnson/Evinrude outboard manual.

It actually stated "before ser#xxxxx use 16:1 mix and after ser#xxxxx use 40:1 mix" and explained this as the reason why.

Perhaps someone with access to older manuals from the late 50s or early 60s could verify this.

If an offshore product called for the richer mixture, I would suspect it did not have needle rod bearings as North American engines now do.

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post #27 of 34 Old 04-11-2019, 06:00 PM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I always went by my dad's theory....Better too rich than too lean.....Too rich might smoke a bit, but too lean will smoke a piston.

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post #28 of 34 Old 04-12-2019, 02:55 AM
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Quote:
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I always went by my dad's theory....Better too rich than too lean.....Too rich might smoke a bit, but too lean will smoke a piston.
,
If you're implying rich by more oil in the fuel mixture that is incorrect because higher concentration of oil actually lowers octane number which will cause detonation and a theoretical lean condition.
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post #29 of 34 Old 04-13-2019, 12:02 PM Thread Starter
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

[quote=Walt 2002;12242545]What does that have to do with my

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post #30 of 34 Old 04-16-2019, 02:12 AM
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Re: Fuel Mixture: Is 25:1 and 32:1 Really Necessary?

I run a semi syn ISO rated EGD and JASO rated FC oil. I mix at 40:1 which is 3.2 oz per gallon but I put 3.5 in cup to allow for what sticks to sides so it is slightly more oil.
I run this in 32:1. 40:1. and 50:1. I won't run anything at 2.4 oz per gallon 50:1 even with Amsoil "super oil" I used to have some of the mobil 1 stuff but I think they quit making it.
If I had anything that was 20 or 16:1 I would add more oil.
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