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Stihl dominates the market for chainsaws in North America, and while most Stihl saws have a good reputation for quality, there have also been recalls for mechanical problems. To find out whether your chainsaw is included in a recall, you need to know the serial number. You will also need it if you are claiming any repairs under your manufacturer's warranty.
Writing down the serial number also helps protect you in the event that your chainsaw is stolen; with a serial number you will be able to claim it back if the police recover it. Set the chainsaw down on a workbench and turn the chainsaw so that the tip of the chain is pointing towards you. Examine the saw's housing just to the right of the point where the chain meets the body of the saw. You should find a decal with a barcode and a number embossed in the plastic of the housing. Look closely at the decal if there is one. The serial number will be printed just below the barcode. Record the number embossed into the housing if you can't find the number on the decal or the decal has worn off.
The embossed number is also the serial number.