If you read the entire thread you will learn I performed the top end rebuild of the engine because of intake valve recession. This problem was not caused by inadequate maintenance; I maintain all my motorcycles very well. Regarding bad luck, I don't know how bad luck enters the equation.
As I stated earlier, I must assume this problem was caused by a manufacturing defect. I hope my problem was a rare, isolated instance.
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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