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To return the liquid portion of the crankcase ventilation back to the sump. Instead of into an old Castrol® fork oil can or Coors® can. The V11 crankcase ventilates from a fitting (#14, first diagram) on the rear, upper right of the block inside the clutch housing, through the nefarious, shaped flexible hose (#18 in the first diagram) under the spine frame that connects to the bottom of the spine just behind the headstock. From there, the vapor portion is extracted (more or less) from the banjo fitting on top of the spine at the headstock into the airbox (#16/17 in the second diagram) while the liquid portion drizzles down inside the spine to the return line which dribbles back into the sump.

Not so much “V11” as it’s gear...but I’ve always wanted a pair of some bad ass Daytona boots. That now can be scratched off the moto bucket list.... Updates forthcoming...just know I’ve been swamped with work/personal health issues blah blah blah... Happy New Year to everyone!

Unfortunately , this (fuel shutoff) is a trait we have to deal with . Don't complain , just fix it and get on with the next issue !

Its actually a nice design let down by cheaping out on the orings to save around $1. My modified version works perfectly and is now rebuildable if the need ever arises which it shouldn't considering the use it gets. It's nice reaching under the tank and knowing you don't need to fight the fuel tap to simply shut it off. Ciao

Awesome. Thank you for your detailed explanation and images. I did not understand this scavenging system. I hope the interior of my spine is free of rust, insect carcasses, and the like! I suppose the oil drizzling through there helps keep it clean. Triumph used the large down tube frame member as an oil tank on bikes in the 1970’s, so I guess the appropriation of frames as oil vessels is not uncommon.

It is a vestigial structure left over from earlier wide sump models that had two oil return lines from the spine frame (one on each side of the spine).

Here you go, one of my favourite Aussie road images. Always enjoy seeing this through the screen just before popping up for the braking marker. Turn 1 Phillip Island Bass Straight in the distance. Ciao