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Sirio have released details on their new XL7 .21 engine for the offroad category. The engine features a 5+2 port ABC liner and a new piston alloy to improve performance and durability. The crankshaft sports the ubiquitous silicon insert while an updated crankcase helps to improve cooling. A carburetor with interchangeable venturis, standard steel ball bearings and a lightened cooling head complete the package.

Source: Schepis Model [schepismodel.it]

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