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Can't pull the Rope on my Stihl FS85 Trimmer

Discussion in 'Mechanic and Repair' started by statman, Sep 3, 2010.

  1. statman

    statman LawnSite Senior Member
    Posts: 271

    That's bad isn't it? Any suggestions?
  2. cgaengineer

    cgaengineer LawnSite Fanatic
    Posts: 15,782

    It sounds like its seized up. Stupid question, but did you make sure that you had fuel with oil in it.
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  3. pugs

    pugs LawnSite Gold Member
    Posts: 3,022

    Take the spark plug out...see if it spins then.

    If not, take the recoil off and try to turn it by hand...maybe rope is off pulley or something else bound up in there.

    If you cant spin it by hand with the spark plug out and recoil off....probably a seized up engine. Time for a new machine.
  4. ajslands

    ajslands LawnSite Silver Member
    Posts: 2,238

    It's probably siezed, and it would probably be cheeper to by a new trimmer or engine rather then find the sieze. You might get lucky one day and break the sieze. Doubt it tho
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  5. statman

    statman LawnSite Senior Member
    Posts: 271

    ya, i mixed the oil. like a dumb... I thought I would save a few bucks and used a bottle of 2 cycle I found in my dad's garage. I know it was mixed right, but it was an off-brand, not the stihl pre-measured I usually use. now my back-up isn't running right, crap!
  6. StihlMechanic

    StihlMechanic LawnSite Bronze Member
    Posts: 1,133

    take the shround and exhaust off, see if the piston is scored. unually when these lockup it is either the clutch or the crankshaft bearing on the flywheel side.
  7. lawnboyman

    lawnboyman LawnSite Member
    Posts: 35

    After you do the above, and IF it isnt scored. Try to use a socket extension, put it in the spark plug hole, and hit it. It may break the seize. Then if it does put MMO in the cylinder and See if it runs...
  8. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 13,192

    And pour 2 cycle oil into the spark plug hole before you try to turn it. I would pull the head off and inspect it before I tried to start it. I have been able to get them going almost all the time. Usually hand buff the internal walls and put in new rings.
  9. statman

    statman LawnSite Senior Member
    Posts: 271

    I pulled it apart and found what I think is the flywheel broke apart (it is the part with fins sicking out of it.) They got wedged aound the the clutch. the piston looks good and it will start now. do you think it is ok to run until I get a new part? Is the part with the fins the flywheel?
  10. cgaengineer

    cgaengineer LawnSite Fanatic
    Posts: 15,782

    No, do not run it...it will be out of balance and cause extra wear oin the main bearings.
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