What is it?

Ok when putting the motor back together and everything I saw this misc. wire that had fallen off when bringing it home and spent several minutes trying to figure out where it went. Well I found out where it went and put it back on before I bolted the motor on seeing how I couldnt get to it when it was bolted in because its on the bottom of the motor.

I cant figure out what this thing does/is, someone told me its probably the temp sensor. To get a idea of where it is located. If you were sitting down directly behind my Foreman looking at the Leak Shield you would look in-between the bottom of that + the top of the skid plate and its deep back in there inbetween the two. It is a bronze looking nut with a little nipple on the tip of it. The 4 wheeler runs fine without it and thats why im really trying to find out what it is.

It came off yesterday during out ride at Holipaw and I need to put it back on. Which I need to drop the skid plate to do so. Hope my crappy directions could give a good enough description.