Sirio XL7 .21 offroad engine
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]