Greetings friends....my first post , although been lurking for years. I happened on a stash of new Craftsman saws when my local sears closed up. 3218 and a lone 4620. I sold the 4620 to a man on Market place two days ago and he was using it to cut a large Walnut tree that day. He called an hour later and said the saw lost power and wouldn't restart....he brought it back, it had no spark, and I sent him home with the last 4218 I had. Called back an hour later with same complaint, I took the 4218 back and gave him back the 4620 with a coil stolen from a junk 240 Husky....hour later the 4620 crapped out again! I told him to bring it back and refunded his money. Yesterday I tore into them both and both had less then 20 lbs compression and deeply scored pistons.. I sent them out full of gas oil mix ( Husky xp) at 40 -1, and it appears he didn't add any fuel. What happened???? I don't believe I had any air leaks and I always adjust a little on the rich side for the carb tuning. Did the OP over rev the saw and fry them because they hadn't been broken in yet? First time I've seen this.