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Stihl 110 trimmer starts, but only once...

Discussion in 'Mechanic and Repair' started by khutch, Aug 31, 2011.

  1. khutch

    khutch LawnSite Senior Member
    Messages: 495

    6 year old Stihl FS-110 has been a workhorse, but got to where it would start, first pull in the morning, and then pretty much refuse to start after that. Maybe, maybe if I pulled way harder than I should, it might kick in after 6-7 pulls but I knew it was time for repair. The usual plug, fuel filter & air cleaner did not do anything, nor did I think it would because it would start first pull in the morning. Not crazy about the dealer but $60 bucks later, other than a valve adjustment and the same things I did, I got it back and same problem. I complained, but to no avail....What else might it be??? Weird problem, starts in the morning like new, then it's a boat anchor....
  2. Sabina Lawn Care

    Sabina Lawn Care LawnSite Member
    Messages: 21

    May be losing compression after it gets hot
  3. khutch

    khutch LawnSite Senior Member
    Messages: 495

    I guess the fix for that after 6 years may be a new trimmer?
    Sometimes tough making the call to put more money into an older piece of equipment. Just wish dealers gave you more for you money on repairs - Shouldn't they have done a compression check on an older trimmer???
  4. RussellB

    RussellB LawnSite Fanatic
    Messages: 8,516

    Try loosening the gas cap. Mine hisses like it is vapor locked but runs fine after I do that.
    Posted via Mobile Device
  5. khutch

    khutch LawnSite Senior Member
    Messages: 495

    Gas cap fix doesn't work......
  6. 2stroked

    2stroked LawnSite Senior Member
    Messages: 296

    It could be losing compression. Might be time for a new trimmer
  7. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    I am going to play stupid and guess that somehow, someone forgot to check and make sure that the spark plug was actually gapped to 020
    only because when I ordered a cap and rotor for my truck the guy behind the counter sold me the cap ONLY and I had to go back today
    with the truck in pieces to buy a ROTOR and it just seems to me that these moments of utter moron come and go as often as they please
    because maybe I'm the idiot by assuming that one should not only ALWAYS sell a cap AND a rotor together but perhaps I am the even bigger
    moron by assuming that folks would somehow check a spark plug GAP before installing it which in turn makes me realize that it is thus very
    possible that whoever installed the plug never bothered to check that the gap was correct.
    Not that I'm the smartest cookie on the planet, if that were the case we would all be in trouble for sure.
    But that is what this problem reeks of, is an improper spark plug gap.
    And I know, call me stupid, but I would check that.

    Oh, and thanks for letting me vent about the truck part, I feel a little better now.
    Oh yeah, gap 020
    uh huh.

    Hopefully that fixes it, but probably not.
    Still I would check it.
    Last edited: Aug 31, 2011
  8. jkilov

    jkilov LawnSite Bronze Member
    from MS
    Messages: 1,415

    Possibly a carb or fuel related problem, but I'm pretty sure what you're describing is a faulty ignition coil.

    The 4-MIX has programmed transistor electronic ignition (PCI - I think) which backs the timing for starting then advances spark timing as the revs go up. Sometimes these modules get "stuck" in advanced mode making them impossible to start.

    The other thing is the induction coil can just be shot. The unit might just start but with heat the coils expand and short through the insulating layers. The unit runs but if you shut it off it's impossible to restart until it cools down.
  9. khutch

    khutch LawnSite Senior Member
    Messages: 495

    Plug gap is good, that is why it starts first pull, first time. I do not have tools for a compression test, again, why could the dealer have not done that when I was in - I'll take it back if I have to return, but I'm sure they will want $$$ for that. Not sure if it could be the electronic ignition, because again, it will start. induction coil sounds possible, again, something I cannot check, or at least not sure how too...

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