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what is the case opening diameter or cylinder skirt outside diameter?
Finding a bigger piston with a 15mm pin isn;t to big an issue aliexpress usually has those options if you look...
The big issue is whether or not a bigger jug will actually fit in a CG125 case.
TBH it would be better to just find a CG250 complete engine and do a total swap rather than trying to modify a smaller displacement engine.
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