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The so-called "80cc" version of the Athena Basic. It therefore retains the 5-transfer architecture, the domed piston and the oval exhaust.
This cylinder must be fitted with a 43mm stroke crankshaft with an 85mm connecting rod. With the 47.6mm diameter of the piston, this cylinder called "80cc" by everyone is in fact a 76cc.
Piston pin diameter: 12mm