For sale: Stihl MS 391 chainsaw. This chainsaw has been well maintained and recently serviced, with a new spark plug, air, fuel, and oil filters. Additionally, the carburetor has been rebuilt and passed vacuum and pressure testing. With an 18" bar and three well used chains included, this chainsaw is ready to tackle any job. Whether you're cutting firewood or trimming trees, the Stihl MS 391 Chainsaw will get the job done with ease.