Hi folks, I'm interested in the differences between the Chinese zenoah g5200 clones in the 45-52-58-62cc range. My understanding was that to upgrade lets say a 52cc saw to a 58cc, one would just have to switch piston and cylinder. In one thread, I read that replacing the crankshaft was also required, perhaps due to port timing, but I am not convinced of that. Replacement cranks are most often marked "fits 45-52-58cc", so I don't really see a difference between a 52cc and 58cc crank, is there one? Does this also apply to 52->62cc conversions (no crank replacement necessary, just top end?). If anyone is the wiser as to explain why a different crank would be needed, I'd like to hear it, as I understand only the cylinder bore width changes, not the stroke? Would be grateful for any ideas!