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MS261 New Coil, now won't idle

Discussion in 'Chainsaw' started by hookset, Feb 7, 2019.

  1. hookset

    hookset ArboristSite Lurker

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    thanks guys - yes, using the recommended plug - actually got it from the dealer, as I stopped to get new fuel filters, etc. early on in the troubleshooting process. I've swapped back and forth from the original plug, to the new plug or old plug, no change in behavior....so I just have the new plug in now, with the new coil and have spark again. Saw starts on choke - sounds rough, won't idle, I can keep it running by feathering the throttle and giving it gas when needed, but never gets close to idle...just dies. Sounds like carb related issues to me, but seems so odd that I would have these issues now. The saw ran flawlessly for the past few years. Ran 3-4 tanks full a week prior cutting up a stand of dead ash trees - no carb issues (before I lost spark). Lost spark, replaced with a new stihl coil, and now the saw won't run right and acts like carb issues/or maybe a vacuum leak, etc. Just hope I'm not dumping more and more money into it. The coil alone was $158 for the part....
     
  2. lone wolf

    lone wolf MS 200T King

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    That will work but pull the muffler it could still be scored if the piston looks good you may have a fuel problem.
     
  3. hookset

    hookset ArboristSite Lurker

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    Just an update. Got a call back from the dealer, telling me the saw is not worth fixing, over $550 of just parts needed - and another $350 in labor. They gave me the saw back in a box in pieces, due to 'liability issues'.....which i found frustrating, especially as I told them to put the saw back together. They mentioned the crank seal was bad, carb was bad, saw ran lean due to the seal leak, and needed new piston rings (which seemed odd as compression was ok from when I tested earlier). It still doesn't make any sense, as the saw ran perfect before I lost spark. They did work with me to return the new coil that I purchased from them and used that credit to buy a new MS261C. Thanks for the advice community, I still don't understand it...but whatever. Thanks.
     
  4. lone wolf

    lone wolf MS 200T King

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    Well post up pics of the cyl and piston and we will see if they BS'ed you!
     
  5. hookset

    hookset ArboristSite Lurker

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    here you go, what do you think? Cylinder looks pretty decent, some marks on the piston.
    thumbnail_image1.jpg thumbnail_image2.jpg
     
  6. lone wolf

    lone wolf MS 200T King

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    Looks like you can clean that up to me ,hard to tell over the net but yes. Now the trick is not to ruin it in the process! what was the last known compression test on it in that condition? dont get conned out of that saw from the saw pirates on here fix it!
     
    farmer steve and pioneerguy600 like this.
  7. lone wolf

    lone wolf MS 200T King

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    farmer steve likes this.
  8. pioneerguy600

    pioneerguy600 Lost in Space Staff Member

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    Definitely clean it up yourself and run it, that is not seriously scored at all. I know the dealerships won`t bother doing so but do it yourself and that saw still has years of running left in it.
     
    farmer steve and lone wolf like this.
  9. hookset

    hookset ArboristSite Lurker

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    Appreciate the help. 145 was compression before I took it to the dealer.
     
  10. HarleyT

    HarleyT Tree Freak

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    The damage doesn't look like any lean damage, but more like dirt ingestion, or the like.
    Post a pic or two of your air filter.
     
  11. HarleyT

    HarleyT Tree Freak

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    Also show a pic of the exhaust side of the piston, that would be the first area to lean/seize.
     
  12. lone wolf

    lone wolf MS 200T King

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    That aint shabby ,you can get that running good! Rebuild it right though.
     

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