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Stihl FS70 problem?

Discussion in 'Mechanic and Repair' started by GreenBlade, Aug 11, 2012.

  1. GreenBlade

    GreenBlade LawnSite Member
    Messages: 216

    So I picked up a STIHL FS70 on monday, new, and I really like it. No problems with performance at all as far as I can tell, but the exaust seems to be shooting out oil! It's getting everywhere and I jst didnt know if this was normal? I am having it looked at regardless this coming monday. I'll put up some pictures so you guys can get a better idea of what I;m saying here. Just let me know what you guys think; all you mechanics out there!
  2. Gatewayuser

    Gatewayuser LawnSite Bronze Member
    Messages: 1,765

    You are running 50:1 oil right? Also try removing the spark arrestor(sp) if you aren't in a dry area.
  3. GreenBlade

    GreenBlade LawnSite Member
    Messages: 216

    Yes 50:1 oil. It was even doing with the gas the dealer put in for me.
    Posted via Mobile Device
  4. Gatewayuser

    Gatewayuser LawnSite Bronze Member
    Messages: 1,765

    Sounds like a bad carb or the engine isn't burning the mix well enough.
  5. GreenBlade

    GreenBlade LawnSite Member
    Messages: 216

    here are the pics.

    photo 1-1.JPG

    photo 3-1.JPG

    photo 2-1.JPG
  6. chagh2.0

    chagh2.0 LawnSite Member
    Messages: 144

    Dude that can't be good bring it back and try a new one.
  7. yardguy28

    yardguy28 LawnSite Platinum Member
    Messages: 4,463

    yeah I don't think that's good. mine doesn't do that and never has.

    I'm using regular 87 octane mixed with the grey stihl oil bottles.
  8. mefast

    mefast LawnSite Member
    from florida
    Messages: 15

    Return it........

    POWDER SL UT LawnSite Member
    Messages: 14

    In my experience, 99% of time I've seen this, it's almost always the oil to gas ratio is mixed to high. I'm also always told everytime, the mix is 50:1, so it has to be mechanical.

    Mistakes happen, someone grabs a 2 gal mix for 1 gal or a 2.5 gal mix for a 2 gal gas. Even at the dealer, the help could have screwed up the mix that was put into the unit.

    Almost always, I replace with new fuel mix and run it for a bit to flush the excess oil out first, then pull the muffler off and wipe out the exhaust port, rinse out the muffler and spark-arr ester before it bakes on. 99% of the time it goes away with just these steps. It's also always best to replace the fuel before breaking down a carb, if not, to find out later that its was in fact the oil mix was in fact to high.

    Your dealer will take care of you, but it would also be a good learning experience for you learn how to take care of your equipment at a young age, by attempting a simple problem solving first yourself.
  10. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Messages: 2,248

    Don't mess with it---get it to the dealer, pronto, let them solve Stihl's problems. Tearing into things may void your warranty, depending on the attitude of your dealer.

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