Stihl 031AV Sprocket - Replace or Not?

[duvallite]

I'm working on getting an old 031AV in good running shape. It's got a 20" bar, 3/8 pitch, .050 gauge, 72 DL chain. The drive sprocket is worn, but I'm not sure if it needs replaced or not before I throw a new chain (Stihl RMC3) on it, and I'm not sure how to tell when a sprocket needs replaced. Here is a photo of it:

Does it need replaced, and how do I tell? If it does need replacing, can someone point me to a new replacement one that I can buy? Also, is there anything else in that assembly that I should replace at the same time, like a bearing or ????? Thanks.

 

[HarleyT]

If you are doing a new chain, yes, replace it.

 

[bmwpowere36m3]

I believe Stihl specs the wear depth as 0.5 mm... looks worn to me. If you getting a new chain, get a new sprocket. Actually get two chains and rotate their use. 4:2:1 (four chains, two sprockets, one bar) I've heard before.

 

[duvallite]

Thanks guys. I was pretty sure it was worn also. I have two new chains for the saw, so I guess I'll search for a new sprocket. Should I replace the bearing at the same time? I had found this sprocket & bearing combo on the web. This should do the trick, shouldn't it?

http://www.lilredbarn.net/Stihl-031AV-Sprocket-Bearings-s/67137.htm