(Not sure if these hooks are on the RS or 1125 bikes - anyone who knows can feel free to chime in and I'll update)
For the 1190RX/SX, remove the passenger seat...
We will be using this hook. There is one on each side, so you can secure up to two helmets at a time...
Hook the D ring from your helmet on the hook, hanging the helmet over the side. Be sure to place the chin strap padding between the rings and the bike to prevent scratches...
Replace the seat...
And that's it. You can walk away from the bike and not have to worry about your helmet. Enjoy!