Been having erratic issues with my CS-3510 this year and just noticed this sprocket looks sort of bad, I think this could be part of the problem. Should this be replaced? 
Would you replace this spur sprocket?
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its fine
You can run that a bit longer, once you see a witness mark in the “valley” it’s time to replace. In other words, when the driver begins to make contact with the valley of the spur gear it should be replaced.
Heck, it's not as bad as this one yet and I took this off an 025 that was still being used by the owner!
Was the owner you????????????
Nope- but it was a local "MR Green" franchise holder- basically a yard and garden caretaking business type arrangement= not sure what the equivalent might be over there- I kept the clutch bell to show folk when they are needing replaced!
Wow. Got his money’s worth out of that one.
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I would wait until it was time for a new chain/chains, then put on a new sprocket.
KostasVolos
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For pretty long time was looking for such advice.Stihl recommends that when the marks on the teeth have more than 0.5 mm depth the spur sprocket has to be replaced .
My Stihl dealer though insisted that this is bs and that the spur sprocket has a longer life than just wearing two chains ( the 4-2-1 "rule" ) .But that did not provide any clue as to when exactly is time for replacing .
Thank you ,sir !
You win!
