Malossi 4-valve cylinder head for between 15-25% performance increase. Great for water-cooled 4-stroke 125, 180, 200, 250 and 300cc Piaggio engines (Leader and Quasar). On 125-200cc engines larger cylinder kits and 4-valve pistons are required, on the 250 and 300cc, no modifications are required. Cast aluminium alloy, hardened and sand blasted. Designed to the finest tolerances. inlets worked to 25mm and outlets to 22.2mm. Cylinder head pre-assembled and ready to install.