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40:1 in an MS261C-M??

Discussion in 'Chainsaw' started by kennyz, Nov 2, 2019.

  1. Andyshine77

    Andyshine77 Tree Freak

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    Hotsaws 101 is full of it!! This has all been beaten to death a million times, all angles have been looked at and discussed, we all have a good understanding of what's what, you're not providing any unknown information. Oil does more than just lubricate! Ultra is bottom of the barrel, burns very dirty at any ratio, It lubes OK though. The fact you have carbon issues should answer the question, the answer is right in front of you. Who ever told you 40:1 will make less power is in the business of selling new saws, not making them last or make more power. Pretty much everyone here recommends 40:1 or 32:1 so I don't know what you mean buy learning to run 50:1 from this site.

    If you start looking for an new car and want to know how good the engine is you ask an independent mechanic you trust, and do as much research as you can. What you're doing asking the salesman, you're listening to the salesmen, instead the mechanics and in some ceases engineers. They want you to believe they know all, when all they want is you to buy overpriced oil and a new tool as soon as possible. Some love Kool-Aid.
     
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  2. MaddBomber

    MaddBomber ArboristSite Operative

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    BwaHaaHaa!! You are hilarious!!
    Wow.
    Okay pal, you win.
    You believe what you want.
    I prefer to believe over 180 years of combined timber experience backed by math, repair costs, and a boat load of analytical data.
    But yeah bro, you. You are right. Appearently you have to be.
    And I just might add a bit of vodka to that Koolaid.
     
  3. AmateurSawer

    AmateurSawer ArboristSite Operative

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    Not to argue but what is the reason?Trying to learn.
     
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  4. Andyshine77

    Andyshine77 Tree Freak

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    OK Pal? no need to get touchy this is not personal to me. This has nothing to do with me, just the info that is already relatively well understood. Feel free to provide the data and change my mind. I'm always open to new ideas and information, however you have yet provided any, other than what some salesman told you. What does 180 years of combined timber experience have to do with understanding the physics involved in two cycle engines? The data from two cycle engine builder like Bell and Jennings among the builder from here and better yet the CART builders provide real information. I'm just calling it as I know it, you are free to disagree.
     
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  5. Andyshine77

    Andyshine77 Tree Freak

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    Mineral oil burns differently for starters, some say it actually burns cleaner than Ultra. They're simply better options available IMHO.:cheers:
     
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  6. Gypo Logger

    Gypo Logger Timber Baron

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    What? I’m really confused now. If I use 40:1 in my new 16” Eager Beaver, will it turn into a Meager Beaver?
     
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  7. Andyshine77

    Andyshine77 Tree Freak

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    No, but it may turn it into a brunette from a blond.
     
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  8. Gypo Logger

    Gypo Logger Timber Baron

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    You mean a three dressed up as a nine?
     
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  9. blsnelling

    blsnelling Site Contributor

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    Actually, he is.
     
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  10. Tom B.

    Tom B. ArboristSite Operative

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    Trooper!
    Feeling old now lol.
     
  11. ericm979

    ericm979 ArboristSite Operative

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    All premix two strokes run slightly leaner when the premix contains more oil. Until they're tuned or tune themselves.

    It's because the carb meters liquid, in this case mixed oil and gas. Its jets and circuits are designed to flow a certain amount of liquid per unit of air. Oil is not fuel. If you put more oil in the premix, there's less gasoline. So your fuel:air ratio is leaner.

    But the difference between 50:1 and 40:1 is small. It's unlikely to damage the engine unless it was running too lean already. M-tronic or Auto tune will compensate for the small difference. As to the power, it will probably be very slightly more, even after retuning manually or letting M-tronic do it. Studies show that everything else being equal, more oil makes slightly more power. Presumeably due to better ring sealing. But again the difference is so small you'll never notice it.

    Saws are very mildly tuned industrial engines. They don't need lots of oil. It's just making smoke and burning $$$ for nothing. I run good synthetic oil at 50:1 in most of my saws. If I was milling or something extra stressful I'd run a little more oil and tune the carb to match (and go a little rich from there for extra cooling).
     
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