I believe you own a Zongshen ZS200GY-2, and you have a Teikei MV28 carburetor; is that correct?
Your pilot mixture screw is set too high. Follow the directions in the post linked below. 
http://chinariders.net/showthread.php?t=11793
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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
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