What a fantastic forum.
I know this isn't a lawnmower problem so please, bare with me. A few years ago my late dad purchased a Stiihl 021 chainsaw. It ran great when he operated it, which wasn't much. But, he died 4 years ago and it had been sitting since then. I had a load of logs delivered to my property to buck up and split for next winter's heat supply. Approx. half way through the log pile the unit began acting up. Acting up in the sense that it began sputtering. Hold the throttle wide open and absolutely no power from it. I cleaned the carb knowing it had been sitting for awhile. Now, that thing was in bad shape. I took all the gaskets and screens out if, soaked it in gumout for 24 hours and rebuilt the carb. It ran like a charm for nearly an entire day. The 2nd day of operation, performed as described above after about an hours worth of running time. No matter what I do to it, it does not have any power to turn the chain. I checked to be sure I didn't accidently push the anti-kickback mechanism forward (which I have done a few time), I didn't touch it, the chain rotated freely when pulllin on it by hand. It's got to be something simple that I'm missing but darned if I can figure it out. Any help will be greatly appreciated. Thanks in advance for any/all advise. Roger