STIHL 4-MIX® engine for Kombi system

Looking to upgrade my Kombi engine unit from the 94 R-CE to one of the KM 131's 

Ive heard mixed reviews of the sthil 4 mix systems -- can anyone advise if they have had problems with them or they have worked out well ? 

Also if theres any need to go to the KM 13 rc ?  Cant really work out the advantages of it at present. 

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  • PRO

    The KM 131 and 131 R only diffence is the handles that i can see and therefore the vibration levels 

  • PRO Supplier

    I used two KOMBI 130 for every job including the big brush attachment in snow ! Excellent, robust and  never a problem over 2 years until a new employee used neat petrol and not the 4-mix and the piston shot out the top of the plastic housing!

  • PRO

    Have two, the 90 and 130.

    Both have given little trouble, 90 is used for general strimming, and sometimes the hedge trimmer attachment. 130 is used for hedge trimmer, brushcutter, and when I can afford the chainsaw attachment.

    Quite a difference in response, don't like the 130 for lawn edging, it is too much, like an all or nothing response.

    Only problem I have had is hot starting in summer, changed the tank breather for a small chainsaw tank breather on forum recommendation, problem has gone away.


    • PRO

      cheers guys -- ill get one on order 

  • PRO

    What are you using it for? If you're just going to do lawn edges, some light brush cutting and hedge trimming then you dont need a 131. Sharp blades make far more of a difference with the hedge cutter than the power does, if its bogging down either you're going to fast or the blades are blunt.


    If you intend to do a lot of polesaw work and big brushcutting jobs with it then I would say you should get a 94 and a 131.

    • PRO

      Hi seth -- will be using it for long reach, pole saw and brush predominently 

      Have two 94 at the moment and loved them but looking to part exchange one for more power - mostly for power brush really but intrested to see the difference on polesaw and long reach 

      • PRO

        seth -- interestingly enough the shtil rep advised using the long reach with caution with the KM131 due to the fact its technically over powered at almost twice the usual hedge cutter power levels. 

        Apparently if you hit any obsticles / metal etc etc the power is enough to destroy the hedge cutter teeth and cause some expensive repairs 

  • PRO

    We’ve got / had the whole range over recent years.

    Without doubt the guys prefer the KM94 2mix model for day to day work, however the 4mix 90/100/130 comes out when grunt is needed and / or power sapping attachments are needed. Always default to the 130 for Heavy cutting / polesaw work.

    4mix versions you either love or hate, we find no problems starting them as each type has its own starting routine.

    There is/will be shortly and battery powered ‘powerhead’ that should be backward compatible with attachments,

    We basically love the Kombi systems ( have 5off sets  ).

  • PRO

    I personally wouldn't have a 4 mix engine. The 70s and the 94s have been pretty good, used as engines powering polesaws (on telescopic shafts), hedgecutters, edgers, a power brush and a tiller. They are much more reliable and also cheaper than the 4 mix engines. I think one polesaw still has an engine from the first run of FS70s (when you had to buy it as a strimmer and take the engine off), so they've lasted OK.

    Strimming is the only thing that will really sap power, and we have FS460s for that.

    When the FS70 polesaw dies I might treat myself to a FS240. Although with a 12" bar on a 1.1 chain the FS70 seems pretty on top of the job.

    • PRO

      Strange how different we all find the same machinery.

      I’d never give up having a 130 somewhere in the Unit ...

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