This guide will walk you through the process of replacing the chain on a Stihl chainsaw. This guide will also show how to properly sharpen a worn out chain. Chainsaws are dangerous tools. Before you start working on your saw, make sure you have the proper personal protective equipment. This includes gloves, a long sleeve shirt and pants, eye protection, and chainsaw chaps if you are planning to run the saw. After you read this guide you should be able to safely disassemble and reassemble your chainsaw.
As with any piece of dangerous equipment, turn off the chainsaw before you begin the repair.
Chain tightness is often a preference of the chainsaw operator, but a good rule of thumb to follow is when you pull up on the chain, two chain links should come out of the bar grooves.
Teeth on a saw alternate which way they are facing.
Skip one tooth to continue to sharpen on the same side. Use the same number of file strokes on each tooth.
Continue to sharpen until you reach the original tooth that was marked. You can then sharpen the set of teeth facing the other way with the same process.