BACK WHEN WE HAD THE BIG ICE STORM, I bought a big husky, that thing would start the first pull every time , but when it derailed the chain (very often) it chewed the drive sprocket up and the back teeth on the chain. I had three chains so I could change them , instead of stopping to file the burrs off when I was using the dam thing. When I tried to buy a new bar for it , there was no bar and sprocket available for it , nothing husky sold would fit it , luckily the stores took the unusable stuff back. I bought a stihl and have been using it every since.