One of those barn finds, it came to me oily and dirty. I gave it a few pulls with a spark tester attached and it started right up. Don't know what the compression is but it feels very good. If you have little weenie arms you might be better off with a Stihl. Seems to run realy nice and starts with 2-3 pulls when cold. If I were to keep this saw, I would possibly put in a carb kit, although it runs great as is. Comes with a 16" bar and chain. Feel free to call me. 541 482 7739