The Tenere has a similar one but slightly larger. The Aprilia engine that I put in
when the Ten threw out its 3rd gear (exactly the same engine / gearing / cam / piston / bore / stroke the works) didn't have one at all, just a straight breather pipe off the casing.

If you go to A J Suttons web site you'll see schematics. ..No cancel that I've just looked but it's still good for reference.

https://www.ajsutton.co.uk/

here's along winded explanation about 'baffling' It might be required to stop excess oil showering back into the airbox http://www.burtonpower.com/tuning-gu...er-system.html

in fact wiki explains the baffle here... https://en.wikipedia.org/wiki/Crankc...ilation_system

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I have a lot of growing up to do. I realized that the other day inside my fort.