Quote:
Originally Posted by culcune
I wonder how much trouble it would be to put one of these engines in a Sierra  ? |
I believe the ZS172MM engine in the Zongshen GS250 has the same stroke (55.7mm), but a larger bore (72.5mm) than the ZS167FML engine of the TW200/ZS200GY-2 engine, which has a bore of 67.0mm.
You could bolt the entire ZS172MM engine in the Sierra's frame, but you would have problems with the exhaust header. Personally, I wouldn't want to mess with it. Because the GS250 engine has a larger bore, you can't put the smaller cylinder head of the TW200/Sierra on the ZS172MM engine.
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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