Welcome, we are glad you joined us.
With only 900 miles on the odometer, I would reconsider running the NC250 engine at sustained speeds above 70 mph. Everyone is different, but I prefer to vary the engine rpms, and keep the rpms in the lower range for the first few thousands miles during engine breakin. I don't remember exactly; what does CSC recommend for running the engine during the breakin period?
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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