Engine was made on 15 June 1979. Both small sprockets on the reel have some wear, the smaller of the two is about worn out. The front chain is slightly slack, before adjusting it with the plastic adjuster you should take it off, hold it on edge by the two ends, and see how much it sags in the middle. The largest sprocket has a bit of wear but could go a bit longer yet. The chains are foul: filthy with grass and grit. That wears them out. They do have a little oil on them, but when you mix dirt with oil it forms a kind of valve-grinding paste.
