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What fuel mix ratio best for M-tronic saws?

Discussion in 'Chainsaw' started by jeffbecky1, Nov 6, 2019.

  1. jeffbecky1

    jeffbecky1 ArboristSite Operative

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    I’m new to these computerized carb saws and was wondering what fuel mix ratio best for M-tronic saws?
     
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  2. Mike Kunte

    Mike Kunte ArboristSite Operative

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    Stick to the recommended oil in a 50:1 ratio. It works perfectly! I recently changed to the Stihl HP Super semi synthetic oil, and my machines are really, really happy on it. Even in our 40 degree Celcius plus summers, everything runs perfectly. And no smoking anymore either!!! Your saws will love you for it! No need to reinvent the wheel here...
     
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  3. EchoRomeoCharlie

    EchoRomeoCharlie ArboristSite Operative

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    It's right in the manual. You did read the manual right?

    50:1
     
  4. full chizel

    full chizel ArboristSite Guru

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    I run 40:1 in mine without issues. I’ve see problems with 32:1 and some have not. 50:1 is fine but i feel better at 40:1.

    HP Super isn’t available in the US.
     
  5. jeffbecky1

    jeffbecky1 ArboristSite Operative

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    I bought this saw used with fried piston I’ve heard there are some bugs in these causing it to run lean
     
  6. EchoRomeoCharlie

    EchoRomeoCharlie ArboristSite Operative

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    I haven't seen a lot of issues with Mtronics running lean...most run rich.

    My guess is that saw was straight gassed. If not, and it really is a lean problem, then you're going to want to figure that out before you run the saw again.
     
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  7. jeffbecky1

    jeffbecky1 ArboristSite Operative

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    I’m going to be running Bel-ray H1-R I’ve heard good things about this oil
     
  8. full chizel

    full chizel ArboristSite Guru

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    Its excellent oil but doesn’t combust properly in this application.
     
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  9. jeffbecky1

    jeffbecky1 ArboristSite Operative

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    What are the effects? Carbon build up?
     
  10. jeffbecky1

    jeffbecky1 ArboristSite Operative

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    I’ll try to get a picture of the piston posted
     
  11. ammoaddict

    ammoaddict Addicted to ArboristSite

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    Yes, bugs can cause problems. I spray my saws with Ortho home defense. It kills bugs up to 3 months.

    Sent from my Moto G (4) using Tapatalk
     
  12. U&A

    U&A Addicted to ArboristSite

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    40:1 always worked best for my 562. No richer than that.


    Sent while firmly grasping my redline lubed RAM
     
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  13. Storm56

    Storm56 NOT blinded by brand...

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    Been using 40:1 in mine for over 4 years now without issue, just like in all my 2 cycle equipment. My stash of Mobil 1 synthetic ran out and am now running Lucas semi synthetic. Always E-free gas with a little extra stabilizer added.
     
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  14. Cycledude

    Cycledude ArboristSite Operative

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    I am always amazed at how many folks love to ignore the factory recommended 50:1
     
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  15. cedarhollow

    cedarhollow ArboristSite Guru

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    like my neighbor who had some old 30 weight laying around, mixed it with the gas and had plenty of old drain oil to lube the chain with now wonders why the saw dont run no more.
    spend the money on a mtronic might as well feed it real stihl oil and non ethanol gas
     
  16. U&A

    U&A Addicted to ArboristSite

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    50:1 is a push by the EPA. Not the people that make the saws.




    Sent while firmly grasping my redline lubed RAM
     
  17. Cycledude

    Cycledude ArboristSite Operative

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    Apparently you haven’t read the owners manual
     
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  18. Storm56

    Storm56 NOT blinded by brand...

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    Obviously you believe everything you read. Tear down some saws that get run hard using 50:1 vs 40:1 mix and then get back to us. I want to see a nice oil film on all those parts spinning at 13,000 rpm.

    Car manufacturers state in the owners manual you never need to change transmission fluid too, yea right......
     
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  19. EchoRomeoCharlie

    EchoRomeoCharlie ArboristSite Operative

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    Buddy has a 461 he bought new pretty much when they came out that's been run at 50:1 it's whole life... thousands of hours on it as he runs a removal business. No issues. That's plenty of service life. Several lifetimes for average cutters.

    Also, I have 250k miles on my Toyota Corolla...same transmission fluid...Pretty sure I'll get 300k+. Oil changed at manufacturers recommended 10k miles with 0W-20 which is like water. Not a single drive train failure. Again...perfectly acceptable service life. I think you ask anyone if 300k miles is a solid life out of a $23k vehicle, they'll say yeah.

    All anecdotal evidence and obviously means nothing to you...but if 50:1 is good enough for thousands of hours of commercial work, it's plenty good enough for me. If it was blowing up saws or reducing service life significantly, we would be hearing about it a lot more than we are. IMO.
     
  20. huskihl

    huskihl Addicted to ArboristSite

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    There are all sorts of reported bearing failures in strato saws due to the heavier piston, lesser amounts of mix flowing through the crankcase, and a general lack of oil. When I dig into them, there is no excess oil anywhere in the bottom end.
    A 461 being a traditional scavenging motor won’t see these issues if tuned on the rich side.
    I get quite a few 7900’s and 034/6 with case bearing failures. All run on 50:1.
     
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