Hanuman wrote:Could be. But not sure what you mean about the scavenging tube delivering oil somewhere, the photo doesn't reveal all that much, but that braided line/tube supposedly led from the rear bank to the sump pick-up point. In any case, its elaborate shape seems to be aimed at directing air out the fairing gills.
You're right. I just had a look at that image again blown up and I don't think it is a tank at all, just a shroud to try to get the radiator airflow to pass out the shark gills where the low-pressure would be greatest. That's fairly conventional practice for air-cooled aircraft engines - well-cooled ones, that is - to put as much effort into extracting the air as you put to getting it into the cowl in the first place.
I'm guessing here but I'd suggest that when they rolled the engine back, the rear head bank moved from being an effective baffle pretty much aligned with the shark gill vent rear face to too far aft and slanted back, and the leading head bank blocked off more of the intake air than in the older position. They're picking off the highest-pressure air from the nose of the fairing to provide a ram-effect for the airbox, the unsplit radiator is now significantly in the turbulence from the wheel, guard, forks etc. so getting maximum effectiveness on the airflow scavenging side would be a logical point for effort. Improving cooling airflow scavenging was the point of the winglets...
Making sure the cooling exit airflow goes out the fairing vents and not back past the tank is also likely to improve rider comfort - roast chestnuts is not conducive to being able to pass on one's DNA..