Signs of a worn out spur sprocket on a chainsaw. Also the changing of a spur sprocket on a Stihl MS201T chainsaw. This applies to all chainsaws of all ages. As the chain wears it also wears the driver wether it is a spur sprocket or a rim sprocket. On the rim setup you can quickly and easily replace just the rim much cheaper than the whole clutch drum and spur assembly.

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