I have an older Stihl trimmer model # FS 72 When it did run, it would not idle. I had to keep it wound up some. It did start easily though. I was using it a couple weeks ago, again keeping it wound up pretty good, and suddenly it died, and hasn't started since. I did replace spark plug, and checked spark arrestor. I have a spark tester that I put inline with spark plug and it seems to have good fire, at least to the plug anyway. That's about all I know how to do. This is a 2 cycle. I had Stihl fuel in it at the time. (that stuff aint cheap) It does have compression, and when I pull the plug, it's always wet, so I believe it is getting fuel. I hesitate to take it to the shop because of it's age. Probably not worth it. Any ideas on what to check next?
Sometimes It's better to keep your mouth shut, and have the world think you a fool, than to speak, and remove all doubt.