I purchased this stihl combi trimmer back in late 2013, it worked well at first but it didn't even make it through the end of the season with out problems. Unfortunately I had other trimmers for my guys to use, and didn't panic about getting it back to the dealer and repaired before the warranty was out. I usually fix all my own equipment anyways since it is a hassle to take to the dealer, and generally an easy fix. It started initially as just being hard to restart after use(which would cause me to lean towards a coil), but this was my first 4-mix in a while, so not 100% sure and didn't just want to throw a coil at it. It eventually was hard to start from cold, and then of course wouldn't start at all. I have cleaned the carb, adjusted the valves, it has spark(not sure if the strength of the spark is good or not), checked the exhaust port, everything I could think of... I have since taken it to a mechanic friend of mine who used to work at a dealer that had gone out of business, and he has done all of the same things I had done, and still wont start. Everything has been tried except the coil, wasn't ready to spend $60 on a coil and maybe not fix the problem and not be able to return it. Anyone have any similar problems? I was also wondering if someone could share the part number for the coil(I don't have the trimmer in my possession at the moment if the # is on the coil itself, forgive me) so maybe I can order one online since I am not anxious to support the place I would get the coil from since they will want you to leave a chain with them for 3 weeks to sharpen it......? The specifics: Stihl KM 90R-Z Combi Engine 4180-011-5310 sn 295045582 purchased in August 2013 Thanks in advance!