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  1. #1
    Member
    Join Date
    Dec 2008
    Posts
    46
    Location
    Pennsylvania
    Tractor
    Kubota L4400 with LA703 loader, Ford NAA

    Default Stihl Trimmer won't start when hot.

    I have a Stihl commercial trimmer, can't recall the model off hand, but it starts on the first or second pull when cold and runs great. After it warms up to operating temperature and I shut it off to fuel or put on more trimmer line, it absolutely will not start no matter what I do. Let it cool for an hour and it starts right up and runs great until shut off again.

    I'm thinking the coil may be getting weak and failing when hot.

    Any ideas?
    Ford NAA and Kubota L4400 w/LA703 FEL

  2. #2
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    37,280
    Location
    Texas

    Default Re: Stihl Trimmer won't start when hot.

    The manual for my Stihl recommends 89 minimum octane gas; says the 87 will run hotter, so yours might be overheating if you are running regular, but I don't think that should keep it from starting if it turns alright when you pull the starter rope.
    Bird

  3. #3
    Member
    Join Date
    Dec 2008
    Posts
    46
    Location
    Pennsylvania
    Tractor
    Kubota L4400 with LA703 loader, Ford NAA

    Default Re: Stihl Trimmer won't start when hot.

    Good thought but I always run 93 octane gas in all my power tools, saws, trimmers, etc.
    Ford NAA and Kubota L4400 w/LA703 FEL

  4. #4
    Platinum Member Furu's Avatar
    Join Date
    Nov 2009
    Posts
    701
    Location
    Washington
    Tractor
    JD 4720

    Default

    I had a similar issue with a Stihl chainsaw couple of years back. Tried several different things, the Stihl dealer thought the coil was the issue but eventually found a comment on another site and played with the idle mixture. When cold there was no indication of any problem but when warm just as you describe . I could wait 5-10 minutes and then would start.
    Bottom line after taking the low speed mixture high speed mixture and idle screw and resetting the problem went away. Give it a try might be your problem and an easy fix. Your manual will describe how.
    JD 4720 - 400CX FEL, Woods BB-720 Brush Bull and BH90X backhoe, Salsco 6210XT PTO Chipper, Farmi 501 Logging Winch, Bo-Dozer Grapple, LP RBT4096, Cammond Road grader/leveler and Rankin Trash Forks

  5. #5
    Silver Member JOE G's Avatar
    Join Date
    Aug 2012
    Posts
    237
    Location
    Eastern NY
    Tractor
    Husqvarna / John Deere

    Default Re: Stihl Trimmer won't start when hot.

    If it is a 4 Mix Engine it could also be a valve adjustment issue.
    Husqvarna YTH24V48LS
    John Deere LT 133
    Husqvarna 7021P
    Husqvarna 562XP Woods Ported with .025 pop up Muffler Mod
    Husqvarna Rancher 55 2005
    Husqvarna 450 Anniversary Edition 2010
    STIHL 009 1998
    STIHL HT 131 Pole Saw 2012
    STIHL FS 110 R Trimmer 2010
    STIHL BR 600 Magnum Blower2012

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