A quick search returns nothing useful. I have a friend, 06 SG, is concerned about oil entering his air cleaner via the vent tubes from the rocker box. I would like to think there is a filter to prevent liquid oil from making it's way to the TB ( efi ). He thinks the oil is fouling his sensor in the TB. He says he has replaced the o rings, but is concerned that it is still happening. He has also replaced the sensor cuz he was getting the fault code. I have the same bike, same motor ( fewer miles ), and I have not seen any of this. Comments ?