The breather goes into the air box for environmental reasons. The oil vapor which is expelled through this is then sucked back into the engine to be burnt.
Obviously this does cause a film developing but as posted, only when you overfill your oil or run the engine really hot..
Why not remove the breather from the air box and run it into a catch tank (like a coke can strapped to the frame)
Simples !
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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