Outstanding performance: STIHL M-Tronic

Giving your best in your day-to-day work you surely should receive the best possible support from your tools. This is why STIHL invented M-Tronic: An innovative system that makes a lot of things possible – even leaving off work early.

How M-Tronic works

M-Tronic is clever: It controls the ignition timing and fuel metering precisely and electronically in every operating mode. It even takes into account external conditions such as temperature, elevation and fuel quality. What does that mean for you? You can focus completely on your tasks and get to work straight away.

The MS 261 C-M with M-Tronic

The MS 261 C-M with M-Tronic, a combination-lever with a one touch stop, decompression valve and ElastoStart.

One system, lots of advantages: M-Tronic

Here is a list of the advantages of STIHL M-Tronic:

  1. An easy start
    Thanks to its ability to distinguish between a cold or warm start electronically, there is only one start position on the combination-lever. M-Tronic electronically calculates the exact amount of fuel required. You can start it up with a few pulls of the cord and without switching the lever, and can immediately accelerate up to speed – to get the job done quickly and with minimal effort.
  2. No manual carburettor adjustment necessary
    M-Tronic electronically adjusts the amount of fuel in the carburettor. It’s ideal for all operating modes: starting, idling, partial and full-load operation, and always takes external conditions into account. All of which saves effort and time.
  3. Optimal engine performance at all times
    Taking engine temperature and engine speed into consideration, the control unit continuously monitors your chain saw’s operating status and meters fuel accordingly – so you can always rely on superb engine performance.
  4. Excellent acceleration
    As a result of the electronic ignition timing and fuel metering system, you can accelerate to maximum speed with M-Tronic quickly and at the spur of the moment – even after a cold start.
  5. Memory function
    M-Tronic remembers your previou settings for an unlimited period of time and restores them when you restart the chain saw. Therefore, when external conditions are the same, full engine performance is at your disposal after every new start. That saves time.

Read comments and comment:

6 thoughts on “Outstanding performance: STIHL M-Tronic

  1. Hello Stihl!
    I have a question for M-Tronic technology, can you help me to understand?
    Electronic control means electronic carburator technology? and about external temperature,elevation and fuel quality, how do this technology recognizes these params? I mean how it recognizing the fuel quality, because the technology of fuel quality recognision need labs, and special personnel for it, maybe people who wrote blog made a mistake while writing this post?
    Please help me to understand.
    Thank you.

    1. Hello Dmitry,
      Thank you for your comment.
      You are right – electronic control means electronic carburetor technology. This is how it works: different fuels and ambient conditions have an influence on the machine behavior. For example high altitudes make the machine run richer. On the other hand a high ethanol percentage in the fuel makes the machine run leaner. If you ever happened to adjust your carburetor into a leaner or richer direction, you probably have recognized the difference in the engine rotation speed. So it is not the fuel that is analyzed, but the reaction of the machine on the fuel (temperature, altitude, etc.). So you may say, our “test lab” is in the ignition module. It analyses the behavior of the machine – whether it´s rich or lean – and adjusts the amount of fuel accordingly. We hope that this explanation was helpful to you.
      Best regards,
      your STIHL team

  2. just bought new 661 very disappointed. Saw acts rich except when under a heavy load. I am a cutting contractor w 25 years experience , have purchased close to 100 power heads for myself and my crews and I feel like still made a mistake with this saw. The problem is that half the work we do is not stumping a big tree . Here the661 performs fine. The others half of the time not under a full load limping cutting brush chunking down windfalls and snags it performs poorly. Out of those 100 saws I can remember 1 failure on a saw that didn’t have at least 1year on it. As far as longevity still didn’t have a problem. The 661 could have been one heck of a saw but what we have is a saw that performs well half the time

    1. Hello Jeff,
      Thank you for your comment and sorry for your inconvenience. Please understand that we are not able to diagnose technical issues over distances. We recommend checking your STIHL MS 661 with your certified STIHL dealer:http://www.stihlusa.com/locator/
      You can also contact our colleagues from our US STIHL Customer Service department at 1-800 GO-STIHL (1-800-46-78445) or use the online form at http://www.stihlusa.com/information/corporate/contact-us/.
      Best regards,
      your STIHL team

  3. I have a 201tc m, about a year old. If left to idle it will stall after 5 – 15 seconds. It’s been doing this for sometime. I’ve read that I should recalibrate it. How would I do that?

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