Quote:
Originally Posted by 2LZ
Great write-up Spud! Excellent and complete, as always.
I remember back in the 70's, when unleaded fuel first came out, it was eating up the valve seats and the manufacturers had to go to hardened valve seats. I wonder if this is what's happening here?
Did the old valves look worn or just the seats?
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Thank you, 2LZ.
Since the valve recession was obvious, I didn't remove any of the valves for inspection. I wanted to ship the untampered cylinder head to Gerry for his inspection. I also didn't care to do the extra work.
Is unleaded fuel required in China? I don't know.
If the Chinese are still using leaded fuel, you might very well be correct.
I remember reading somewhere that the Italian company, Piaggio, designed the NC250 engine. I suspect the Italians designed the engine for use with unleaded fuel.
I'm hoping my experience with this problem is a rare exception. However, I felt an obligation to warn others who might be experiencing the same problem.
__________________
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