Does anyone know for sure if the 100cc and 125cc cylinder are the same casting? Meaning, does IAME use the same cast iron sleeves for both cylinders? The only difference being the final bore sizing, 100cc = 48.2mm & 125cc = 54.0mm. If IAME uses just one linear, the wall is 2.9mm per side thicker on the 100cc vs 125cc.
Bottom line, can a 100cc cylinder be bored to 54mm to reach 125cc displacement. The bottom ends are the same between the two engines. I also now the heads are different. I’m looking at buying a 100cc engine for parts. I have a 125cc