MS261 New Coil, now won't idle

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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....
 
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.
 
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.
Well post up pics of the cyl and piston and we will see if they BS'ed you!
 
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!
Appreciate the help. 145 was compression before I took it to the dealer.
 
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