While we talk about "Suzuki" GS clones, Humanbeing, I have to ask, because I believe that you know this.

Is crankcase of 125 cc engine the same as 200 cc engine crankcase? Is it possible to fit 200 cc's crankshaft, piston, cylinder head, cylinder studs, cam chain, etc. without additional modifications of the 125cc's crankcase? Is distance between cyilinder studs same in 125 cc and 200 cc?