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Newbie - working on a Skil 1612 that sat for about a dozen years and first time working on a chainsaw, mentioned it in my introductions post. Took it apart, cleaned it and put it back together. Had to make a new gasket for the fuel/oil tank and also rebuilt carb. Put it back together, got it started on the third pull and ran into two problems. Chain was spinning instantly after it fired and toggling the switch wouldn't shut it off. No injuries or mayhem - I didn't know what to expect so was in a safe position and place when I started it. Thought maybe the switch wasn't working since the saw wasn't at lower speed/idling correctly; I was able to back off the idle adjustment with the screwdriver and the saw cut out suddenly. Couldn't get it to restart after that and then it just was fuel coming out of the muffler. Took it apart partially, checked ignition, no spark. Took it apart today to check rest of it and the flywheel key is sheared off. My question is if the flywheel key sheared because of the stop, did that impact the timing on the ignition and that's why I couldn't restart/get a spark? In addition to figuring out a replacement for flywheel key, if I can find one, just trying to understand if I need to troubleshoot something else in the electrical. Know the idle and carb settings were bad/not correct/unsafe - found the manual online for the original settings and was going to try to use those as starting point to tune if I could get it running again. I was using 40:1 premix; this saw originally called for 16:1.