homelitejim
Full of Scrap
I was going to comment but noticed that this is a Zombie thread from about a year ago so I am sure the OP has figured out that 50 to 1 is a saw killer when using alki gas. I use 32:1 with 92 unleaded and Husky XP and no carbon or excessive smoke here, I also have nice brown spark plugs. I was using 40:1 until I pulled the plug on my brand new Echo CS400 and saw that it was white, adjusted mix and no more white plug.