Welcome to these forums, and welcome to The Cult of The Zong, Ben!
The stock Zong has a 15T countershaft sprocket, which gears the bike too high.
If you bike has the 15T CS sprocket, that would explain the difficulty pulling away from stop lights, and I suggest you replace the 15T sprocket with something smaller.
I really like the torque I get from the 13T CS sprocket. However, if you are riding mostly on the street, you might prefer a 14T CS sprocket. Your Zong employs the same coutnershaft sprockets as the Yamaha TW200 motorcycle.
http://chinariders.net/modules.php?n...ewtopic&t=7565
http://chinariders.net/modules.php?n...ewtopic&t=7727
http://chinariders.net/modules.php?n...ewtopic&t=9240
Spud
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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