But you can install a piston from a Honda CB400 and then you will have 93cc. At this time I'm not sure about the model. I have this informations not in my mind and must ask a buddy.
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It would be easier to mount a xr80 camshaft and 20mm carb, it`s not exactly as fast as a 100ccm engine but should do 90 km/h, which is quite a bit faster than a stock cy80. It`s cheaper too. You could also buy a Wiseco xr80 piston (offently for sale on ebay.com)up to 50,5mm which gives you 90 ccm, and slightly higher compresion.