Aluminium 4-valve cylinder head for the 107cc aluminium cylinder kit from Polini with the 4-valve piston for Honda XR and Polini minicross and minimotard pitbikes with 110cc XP4T engines. The combination of Polini cylinder kit (119.0090) and this cylinder head achieves an output increase of 16hp at 13,000 RPM according to manufacturer´s specification.