I have fairly new, 5 or 6 years old, not used alot, stihl farm boss. Hasn't been cranked in about 2 years, I've been using my kobalt electric saw since all the tasks have been smaller trees and limbs. Anyway, got it out to use it last week and it was very hard to pull so hard that I thought I might break the pull rope, so I gave up. I used trufuel the last time it was used and it still has some fuel in it. Any thoughts or suggestions? A man living in the country needs a real chainsaw from time to time