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Stihl 310 Problems

Discussion in 'Chainsaw' started by thewoodlands, Oct 28, 2019.

  1. thewoodlands

    thewoodlands ArboristSite Operative

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    I have a Stihl 310 that starts fine but after about 20 minutes of use will stall out or if you let up on the throttle some after coming out of the cut, it will die out.

    I took the muffler off and the piston looks good, any ideas on what could be causing this? The saw is either 10 or 11 years old.

    The gas in it is new non ethanol and the gas filter is fairly new (two months old) and the saw goes out clean before being used.
     
  2. Justin Taylor

    Justin Taylor ArboristSite Operative

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    Dose it start back up right away?
     
  3. thewoodlands

    thewoodlands ArboristSite Operative

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    No, there are times it won't like it's flooded and there are other times I'll let it sit for about 5 or 10 minutes and try starting it.

    I tested the compression after running it and letting it sit for an hour, 140 was the reading after 12 pulls when it stopped going up.
     
  4. HarleyT

    HarleyT Tree Freak

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    Likely a bad fuel line.
    If you find cracks, or it is soft and gummy,

    replace the line and go through the carb.
     
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  5. thewoodlands

    thewoodlands ArboristSite Operative

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    @HarleyT , the gas line felt fine and I couldn't see any leaks. I did take the carb off and it looks fine from the outside, the filter and the gas tank were pretty clean after I drain the gas earlier today.

    Would it do any good to spray the carb when it's together, I've never had one a part.
     

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  6. Huskitoter

    Huskitoter ArboristSite Operative

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    Try opening the gas cap when it occurs. The tank vent may be going bad. Easy to check.
     
  7. thewoodlands

    thewoodlands ArboristSite Operative

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    I've tried that and it didn't make any difference, I took some air to the vent line too and it was clear without any cracks, the nipple on top of the gas tank the line fits over is clear.

    This morning before running it I replaced the spark plug, air filter and some fresh gas mixed 50-1.
     
  8. thewoodlands

    thewoodlands ArboristSite Operative

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    I bought a parts saw and took the carb out of the 310 and installed the carb from the parts saw and the 310 is running fine, I haven't had any of the problems I had before.

    I did buy a carb kit so I can rebuild the old carb, here are some pics from the old carb out of the 310.
     

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  9. thewoodlands

    thewoodlands ArboristSite Operative

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    I finally took the carb apart and it's soaking in mineral spirits, tomorrow after plowing I'll dry it off and take some air to it. After that I'll spray it down good with carb cleaner,dry it off and take the air to it again.
     
  10. thewoodlands

    thewoodlands ArboristSite Operative

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    How do the two copper looking parts in the picture come out, special tools?
    101_9854.JPG
     
  11. Bfletch

    Bfletch ArboristSite Lurker

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    What would a cause be if it does start right back up?
     
  12. Justin Taylor

    Justin Taylor ArboristSite Operative

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    Lots of things something I could think of would be kill switch do you have a similar problem?
     

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