The TW200 guys are always making modifications to their bikes. However, I never heard of anyone putting the TW200 countershaft into an XT225 engine. I might be wrong, but I seem to remember it won't work. I do know the XT225 has a 6-speed transmission, and the XT200/TW200/Zongshen engine has a 5-speed transmission. :?
Spud
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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