There was only the vented rear cover on TLR's and 98+ TLS's.
All TL's have the tube inbetween the V.On the later bikes that has an internal reedvalve allowing inward flow only or oil return from the baffled plastic tank which has the hose going to the rear cover and another up to the airbox.
One problem with that baffle is both airbox and rear cover hoses are going to the same side inside the baffle.The internal divider is below the hoses,the vent back to the cases/reedvalve is below that so oil/vapour can still get to the airbox to easily.
On the 97 TLS there was only a hose from that tube coming out of the cases and going up to the airbox.From my findings there was some debate about reedvalve flow directionon the 97 TLS...Some when asked said inward flow? others said outward which would seem logical given the layout.
I am sure you have heard the stories about oil pissing out of gaskets etc due to crankcase pressure in some cases.Ducati's have little more than a reedvalve vent out of the cases at the rear but the size outlet is much bigger than the TL.The reason some folk plumb bigger hoses into both valve covers on the TL and run some kind of baffled tank with a return to the case.
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