Here is something you can try. Remove the fuel tank, and disconnect the MAP/MAT sensor, as described in the thread linked below.
http://www.rx3forums.com/forums/show...-loosing-power
If the sensor is dirty, clean it, and re-install.
Does your used motor oil smell of gasoline?
__________________
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