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Stihl 400 not running well

Discussion in 'Mechanic and Repair' started by Jordanfan20, May 15, 2009.

  1. Jordanfan20

    Jordanfan20 LawnSite Member
    Posts: 89

    My stihl 400 has been starting up just fine.... the first time. When I take out the blower it seems to start in about 4 pulls two chokes and two normal, but then once I shut it off it has trouble restarting and could take anywhere from 5-30 pulls to start.

    The spark plugs need to be changed but I was wandering if you guys had any advice or ideas on why this is occurring?
    Thanks guys
  2. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,960

    Don't know why but here is the drill on Stihl 400 and 420:
    When it is cold......pull it until it fires with choke on. Then immediately turn off the choke and it will start with 4 more pulls. Once it is hot never choke those duds and they will start in 4 pulls. Now this assumes that you have good plug, fuel filter and air filter clean and not plugged outlet.
  3. Jordanfan20

    Jordanfan20 LawnSite Member
    Posts: 89

    Thanks man, I'll give it a shot tomorrow.
  4. ashelton

    ashelton LawnSite Member
    from florida
    Posts: 150

    I am having the same problem with my 420. It starts fine the first couple of times, but after it has been run for a while, it sometimes will take up to 30 pulls. I don't choke it after it has warmed up, and always keep the air filter and plug clean. I also have seen fuel on the air filter sometimes.

    If anybody has any suggestions, please let me know.
  5. No Bull

    No Bull LawnSite Member
    Posts: 60

    Sounds like you might want to try a new carb kit. If the carb is getting old sometimes they start to have flooding problems. a new carb kit will usually fix that problem. Good Luck !

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