That's a typical clone of a Honda pushrod engine.
You might want to check the valve lash specifications in the following thread.
http://www.chinariders.net/showthread.php?t=977
The valves in these bikes always make some noise, even if the valves are adjusted properly. Also, slightly loose valves are much better than slightly tight valves. Always remember, slappy valves are happy valves.
What motor oil are you using?
__________________
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