Oil leak help/part identification.

Hey guys, new here so go easy :icon10:

I picked up a Chituma 200cc trail bike the other week, not sure of the exact model as its been resprayed and isnt listed one the v5 so I'll get a picture up at some point. I'm assuming its in the GY series, its a 2005 model but with disk brakes front and back and USD forks. Also an exhaust on the left hand side :confused1: which is odd.

Anyway, I did a quick service on it and found some stuff that needs attention, most importantly an oil leak. I know where the leak is from but I've got no idea what the part is.

Sorry for the link im using my tablet:

http://i256.photobucket.com/albums/h...d0b5974203.jpg

The picture was shamlessly stollen from another user as I dont have one, anyway, the black part that looks like a cap with cables coming out of it, up and left from the gear spindle, what the hell is it? I've tracked the leak down to coming out of the underside of it where it doesnt look like its seated properly so any ideas guys?

Cheers for the help.