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That is a ct70 clone not a st90 clone ,st90's are a little larger bike ,and they have spoke wheels and were only available for about 3 years or so ,at least in North America .Anyways ,the bike you are looking at will have a general pit bike engine in it ,yes you can make it a 125 ,bit it will take much more than a jug and piston ,they sell those bikes with bigger engines in them ,or you would be better off swapping an entire larger engine in rather than dealing with the issues making the engine larger .
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