Yes, I cut the back from my headlight assembly for two reasons. I want to allow the extra heat produced by the hotter H4 bulb to escape, and to help preserve the plastic headlight reflector. Also, sectioning the back of the headlight assembly makes it much easier, and quicker, to change headlight bulbs.
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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