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Stihl av28 wood boss dies after 5 minutes

Discussion in 'Chainsaw' started by ba_50, Aug 14, 2019 at 8:19 PM.

  1. ba_50

    ba_50 ArboristSite Member

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    It has a new carb, fuel line and fuel filter, plug. One crank seal was replaced. What is most likely fix? Head gasket, other crank seal?
    Thanks
     
  2. Ozhoo

    Ozhoo Addicted to ArboristSite

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    With it running that long I'd be looking at either low compression or a plugged tank vent. Does it restart when it dies? Eliminate the tank vent by pulling it off and running the saw. It's a grub screw/screw setup. Do you have a compression gauge? A failing ignition could also give you those symptoms.

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    backhoelover and ray benson like this.
  3. Gord404

    Gord404 ArboristSite Operative

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    A little more info would be good,-what were the systems when it died, just stopped or slowly died, compression feels lower now, etc
     
  4. ba_50

    ba_50 ArboristSite Member

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    It will run for 5 minutes and then starts bogging down. Take it off the log it speeds up again. Leave it on the log and it will die. The vent hose was new but I took it off anyway. Same result. The compression is ok.
    It has never had anything electrical done to it.
    It will restart but not easily.
     
  5. redunshee

    redunshee Addicted to ArboristSite

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    Can you provide the compression number? If it’s above 130 it should be okay, though not great. Might also check the muffler. Spark screen might be clogged,or the muffler itself is clogged. Other than that have you adjusted the high needle on the carb?
     
  6. ba_50

    ba_50 ArboristSite Member

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    Can't find the gauge. The muffler isn't attached. Carb adj doesn't help
     
  7. HarleyT

    HarleyT Tree Freak

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    you are running it without a muffler?
     
  8. ba_50

    ba_50 ArboristSite Member

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    I use headphones.
     
  9. ba_50

    ba_50 ArboristSite Member

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    I use a Husqvarna. Would lack of a muffler cause this much trouble.
     
  10. Gord404

    Gord404 ArboristSite Operative

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    They do more than just keep the noise down, imo it will kill your top end in short order.
     
  11. MontanaResident

    MontanaResident Addicted to ArboristSite

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    2 Stroke engines (scavenging) need the back pressure. The 2 stroke engines expel burnt gas while during intake of fresh gas. Without the back pressure the engine will not run correctly.
     
  12. ken morgan

    ken morgan ArboristSite Guru

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    let me cut though the BS...just buy a husky and be done with it. :) somebody needs to say it sooner or later.,
     

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