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Stihl 4 mix , the throw away trimmers.

Discussion in 'Lawn Mowing' started by dishboy, Aug 4, 2012.

  1. B&SFTW

    B&SFTW LawnSite Member
    Messages: 232

    they have figured out how to lubricate a small engine with a sump system without angle restrictions, and without starving the engine for oil. that to me is "right". I will even admit, while it is nice not to burn the oil, that is not part of the definition of lubricating an engine right.
  2. GMLC

    GMLC LawnSite Platinum Member
    Messages: 4,345

    3 years of very hard use on my stihl fs90r with no problems. Had run stihl 2 cycles for 12 years before the switch to the 4 mix. I was nervous at first but now Im sold. The 4 mix is awesome with tons of low end torque and easy starting.
    Posted via Mobile Device
  3. frotis

    frotis LawnSite Senior Member
    Messages: 396

    I prefer my Stihl FS80R over my FS90R is lighter better balanced, and rarely ever need to run it at full throttle. Plus you have more range on the throttle, the FS90 is basically full or nothing.

    I would have bought a few more if I knew they were going to stop making them.
  4. Belgium

    Belgium LawnSite Member
    Messages: 166

    Our last km130 (bought in march this year) has been twice in the shop, one time to get new valves and 1 time to get a new carb (luckily it was all covered by warranty, lucky me :S ). Our other km130 which is 2 years old and gets used everyday, still runs fine. But what else can we buy that is so multifunctional and powerful at the same time? I tried the maruyama combi and hated it (not enough power). Probably the same for the echo version although i haven't tried that one.
    Posted via Mobile Device
  5. kawasaki guy

    kawasaki guy LawnSite Fanatic
    Male, from USA
    Messages: 16,520

    should i stick to shindy 2 cycle og should i try a stihl?
  6. jkilov

    jkilov LawnSite Bronze Member
    from MS
    Messages: 1,415

    I am resurrecting this thread to post my disappointment in the 4-mix as my FS 90 died yesterday after just 2 seasons. I tore it down to find a burned exhaust valve and worn cam pin.

    Personally I don't think 4-strokes are a bad design but it seems with the 4-mix Stihl targeted to make a 4-stroke that costs no more than a 2-stroke. A lot of internal parts look cheaply made and I think that's the real problem.
  7. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    Was the valve chipped or just have a burned appearance? What grade and brand of gasoline and what oil mixed at what ratio? Exhaust valves get burned because they're overheated. A low octane or cheap no name brand gas can cause that. I'm just wondering, not being critical.
  8. HenryB

    HenryB LawnSite Bronze Member
    Messages: 1,848

    I've had about 12 4mixes I sell them after 2 seasons. I've had great luck with them and I run 87 octane and Walmart 2 cycle oil. I'm really starting to wonder if Walmart 2 stroke oil is better than Stihl Ultra, Amsoil, Opti 2 etc.
  9. Roger

    Roger LawnSite Fanatic
    Messages: 5,943

    If this thread had a 14+ month "dead period" about Stihl 4-mix troubles, I would use that as a marker of great success for Stihl 4-mix products. While jkilov may have had troubles with his unit, the lack of posts against this thread is a sign that nearly all are not having troubles with their Stihl 4-mix.

    Also, "2 years" is not enough information to be useful regarding the longevity. If the unit was used sparingly by a solo operator, two years would seem a short life span. If, the unit was being used as part of a crew, when it was being used several hours every day in a climate that works year around, then two years sounds like a good life.
  10. GQLL

    GQLL LawnSite Senior Member
    Messages: 846

    People like beating a dead horse. We run stihl never had problems with the 20 pieces we own

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