Gentlemen, I would like to share a recent experience I had at the store. A 250 was brought to me "needing a tune up" he said. I was willing to wager that the carb had junk in it (there was a little, but not terrible). I went ahead and did the "small engine check" for the fun of it, and to show a newbie how things work. We discovered that the flywheel was set a fair distance from the flywheel. Enough that I went ahead and reset it to specs with the provided Stihl gauge. Cleaned and replaced the diaphram in the carb, and was ready to go. Went out and gave it a pull. Clunk. Went back in, whipped out the torx driver and pulled the starter and found this: It's a little flat nub that sticks up from the opposite side of the flywheel about .020+ And now I understand why it had the magneto set out so far... Well.... what to do? I decided that I would just file that sucker off! Put it back together witht he magneto gapped coccectly, and the saw runs like a watch now. He picked it up last Sunday and told me that it had locked up on him once as well. Oh really.... how interesting. Told him what I had found, and how I fixed it. Curiosity got the better of me at this point and I checked the two MS250's we have on the shelf, and guess what I found?? I call it "casting flash" for lack of a better term, but I don't think it is supposed to be there. Further, I don't thing that the magneto should be spaced far enough to clear this thing! Two wrongs do not make it right!