Stihl trimmer won't start

Discussion in 'Mechanic and Repair' started by John_99_2007, May 30, 2007.

  1. John_99_2007

    John_99_2007 LawnSite Member
    Messages: 127

    Stihl trimmer quit and wont start. Only a backfire if I prime and choke. But no fire at all. Any ideas?
  2. cmitcham

    cmitcham LawnSite Member
    Messages: 10

    how old? last year when i got a new fs90r (?) the dealer said not to use the choke, and very few pumps of the primer bulb, that they shouldn't be needed. of course i forgot, and after a couple months starting it with the choke on, it quit just like you describe. since it was so new, i didn't even look at it, just took it back. a couple days later he called and said the air filter and plug were both saturated with fuel.

    although he claimed he didn't have to, he covered it under warrenty. but he scolded me to stay off the choke...
  3. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    stick a new plug in there and try it
  4. cpel2004

    cpel2004 LawnSite Bronze Member
    Messages: 1,415

    Check your muffler screen for build up.
  5. Jay Ray

    Jay Ray LawnSite Fanatic
    Messages: 6,510

    Turn it carb down for a few hours and see if fuel drips from the air filter. Needle valve could be bad and flooding the combustion chamber.

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