What is this weird spring on the crankcase of my 1982 Honda XR80?

What is this weird spring on the crankcase of my 1982 Honda XR80?
What is this weird spring on the crankcase of my 1982 Honda XR80

Tensioner of the screw that holds the rubber bump stop. The spring lets the rubber distort much more than if the spring was not there.

"On" means stuck on with chewing gum? Take it off.

Can't spot it, but you know where it is on the crankcase so have a look here and tell us.

Not a real good picture. Might be some sort of crank ventilation check valve. Almost looks like innards of a garden hose check valve, to prevent backflow into a trailer's potable water tank.
If it were a dry sump (not likely) it could be oil bag check valve to prevent wet-sumping. I really doubt this, last I saw one was on a '47 WLA.

Can't figure from the single picture. Which is why you take to a motorcycle mechanic and have him tell you what it is.

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