I got a X440S here, and just found 3 wires labeled with "02 sensor".
The wires are not connected to anything. I took a picture and can upload it tonight.
Have I found something special, or did all dirtbikes come with that?
X440S with 02 sensor wires
They are on all of the newer harness' for all ATVs and Motorcycles. They were never used and were for future development. The wires will short out though if they are left uncovered causing stalling issues. The bulletins say to cover all three of them with one big piece of heat shrink as a second barrier.