my son took in a stihl saw that was used back in the day. man i couldnt pick it up and hold it by myself!! and it had the longest bar ive ever seen on a saw.that thing had to have had atleast a 5 ft bar.well mybe a 4 ft but it was super big and it was super heavy.took 2 men to hold it.!!!oh yeah. keep them out of the dirt and knots and they will stay sharper longer.and watch for things that have grown into the trees. i once hit a fence wire that wasnt visible until i caught it with the chain. the saw flew out of my hands and hit the tree then the ground.and i didnt stop runnin backwards for AWHILE!