My OCS came from the factory with the opposite orientation, as did the initial bikes delivered to CSC, and many others on this forum.
I do know the official orientation will definitely collect more fuel in the clear tube below the OCS.
At the 12:32 mark in the following video, you can see the OCS was not installed in the official orientation during the CSC Western States tour.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894