Hi Salty, thanks for posting these pics for us, with good pics it makes it easier to diagnose any probs.
I agree with Joe, the cutter sprocket looks a little tired, but is still serviceable....the rest are all quite serviceable and should last for a long time if kept well lubricated. As Joe has suggested, we do need a pic of the small upper primary engine shaft sprocket.
With the cutter (double) sprocket....if you do decide to replace it; you will need to replace the primary chain as well....as using the old chain will clag the new sprocket in next to no time.
