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  1. Al Smith

    Stihl MS 170

    I won't think ethanol in the fuel would screw it up that fast .No matter,they fixed it .
  2. Al Smith

    Stihl MS 170

    What it could be happening sounds like one of two things .If the fuel shut off lever is set too low it won't fill the fuel chamber completely up and at full throttle you're actually over running the carb .It could possibley be the diaphragm has gotten stiff and that will give the same symptoms ...
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