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Message: <blockquote data-quote="John R. Reist" data-source="post: 4065625" data-attributes="member: 39483"><p>My brother cuts fire wood for a living and is kind of a Stihl snob. He will give each tooth on his saw about three swipes with a file every tank of gas. He doesn't wait until the chain noticeably dulls, he says sharpen a little every tank of gas to maintain a sharp edge. Keep a constant angle when you file and throw away the file when it starts to dull, thy are consumable. And after several tooth sharpenings you will need to check the depth gauges (rakers) on the chain and file them down otherwise it won't matter how sharp the tooth is, if it can't  reach and get a good bite in the wood it won't cut . And don't hit things when you are cutting! If he hits a rock of fence wire ,he often just throws the chain away, says it will never cut quite as good no matter how much you sharpen. I Hope this info is of use to someone.</p></blockquote><p></p>