No, I have not heard of this problem occurring with any other NC250 engine in other motorcycle.
![Shrug](images/smilies/shrug8.gif)
I'm pleased to hear that many RX3 owners have reported their valve clearances have stabilized.
![Thumbs Up](images/smilies/smiley_emoticons_tmbs1.gif)
However, if you ride many miles and the valve clearances
won't stabilize,
something is wrong.
__________________
Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
![Wink](images/smilies/windfk.gif)
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