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You can check the VIN (Vehicle Identification Number, serial number, or whatever they call it in England) and find out exactly the year and model of the dirt bike. From what you've said, it sounds like your motorcycle is a CR80 or CR85. The CR80 is likely to have a displacement (engine size) of around 80cc while the CR85 might be around 85cc. That only refers to the displacement when the bike came from the factory. It is popular to "bore out" the cylinders to increase displacement and horsepower, so your bike may have come from the factory as an 80cc (CR80), but the person who sold it to you could have increased the displacement to around 85cc.

The only way to know the true displacement is to physically measure the cylinder.
 
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