I suggest you call CSC for the definitive answer to both questions.
However, the
EC Cami 250 Owner's Manual specifies the torque for the counter shaft (C/S) sprocket to be 55 Nm, which is 41 foot-pounds.
Are you inquiring about the screw which holds the air filter assembly together? If so, it might be included in part #9, the Air Filter Element Bracket.
http://www.cscmotorcycles.com/category-s/154.htm
__________________
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