stihl trimmer dies when it gets hot

Discussion in 'Mechanic and Repair' started by ferris hilton, May 5, 2008.

  1. ferris hilton

    ferris hilton LawnSite Member
    Messages: 33

    trimmer runs fine when cold, but when it has been running for 10-15 minutes it dies and won't start again.
  2. retrodog

    retrodog LawnSite Silver Member
    Messages: 2,429

    my 85 does the same thing, haven't had time to let the mech look at it.
  3. kjslawn

    kjslawn LawnSite Senior Member
    Messages: 618

    Its most likely the coil I had to replace mine after 2yrs heavy use
  4. Roger

    Roger LawnSite Fanatic
    Messages: 5,943

    Ditto on the ignition module suggestion. My FS85 exhibited the same problem, and a new module solved the problem.
  5. ferris hilton

    ferris hilton LawnSite Member
    Messages: 33

    how would you check if it is the ignition module
  6. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    well you would have to get it hot then when it dies on ya be quick and check the spark. but you can count on one thing if a lot of people tell ya its the coil it gona be the coil. and i am telling ya also its the coil. big problem for the 80's/85's great line trimmers dont get me wrong, the BEST their ever was but weak in the coil.

    opps i loked at you thread again. and you did not mention the model# but if its a 4-mix they also have problems with the coil as well.
  7. ferris hilton

    ferris hilton LawnSite Member
    Messages: 33

    thanks i'll try that
  8. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Messages: 3,716

    typical sthil problem=pos
  9. lawnbutch

    lawnbutch LawnSite Member
    from Colo.
    Messages: 177

    Ditto that!!!!! I trash canned mine and went with a different brand. The stihl 4mix is by far the worst!!!!!! IMO

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