I had a look on mind. If you look on the left bottom side of the engine you’ll see the water pump just in front of the gear shaft. You’ll see some other small pipes passing there that goes from the float bowls of the carbs just behind the back edge of the bottom fairing and comes out at the bottom of the bike. Just rout it with them.
If I had a camera I’d take a pic.
Let me see if I can't get a routing diagram in the manual...

 

I haven't figured out how to post photos so I quickly rigged something for you.
Go to this site: http://gerharddvs.spaces.live.com
click on photos and the find the photo labeled: breather tubes

 

hmm interesting, seeing the tubes are supposed to be over there, how would it end up by the rear tire?

 

I don't know maybe the previous owner thought it looks nicer there.