Zongshen GS250 - Clutch + other issues

[SpudRider]

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.