Here are the rumors from China regarding future editions of the Zongshen RX motorcycles.
The RX4 will have a 350 cc engine.
The RX5 will have the NC450 engine.
The RX7 will have a 500 cc, V-Twin engine.
I haven't heard anything regarding an RX6 bike.
http://www.mychinamoto.com/forums/sh...1496%3B/page15
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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