I think Pliskin means your mpg figure is low.
How hard are you racing the Vento? If the carburetor is jetted properly, you should be getting 75 mpg, or higher, unless you are either flogging the bike, or constantly fighting strong headwinds.
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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