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If I remember correctly (it's been quite a while, like 40+ years) since i owned a Honda 50, the cover you are referring to is threaded into the side cover, (so I would assume it just un-threaded itself and fell out) underneath the cover (which is missing) you see a set screw with a lock nut, this is used to set the auto-clutch. Now, as to that setting, I simply don't remember, but I would assume, too tight (screwed in) and the clutch won't disengage, too loose (screwed out) and the clutch will slip. I'm sure there is a "proper" setting of some type, but, at least here, it is lost in the fog of passing time.
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