Technical features Material: special die-cast aluminium alloy. Geometry of heat exchange surfaces recalculated and increased. Machining: numerically controlled high precision machines with diamond tools. Viton head gasket. Hemispheric combustion chamber with centred squish and spark plug.

Material: Speziallegierung aus Aluminiumdruckguss. Vergrößerte und gestauchte Geometrie der Wärmeaustauschflächen (luftgekühlte Modelle). Vergrößerte und neu berechnete Dicken und Längen der Kühlkreisläufe (flüssig gekühlte Modelle). Bearbeitung auf rechnergesteuerten Präzisionsmaschinen mit Diamantwerkzeugen. Antioxidierende Oberflächenbehandlung.

In order to install V4 HEAD on Piaggio engines 125 - 250 ie 4T LC produced as from September 2014 and featuring roller rocker arms in the cylinder head, you need to buy Malossi camshaft (Code = 5911962), besides PIAGGIO products.

H.T.S.R. HEAD (High Turbolence Squish Racing) Heads with high turbolence concentric combustion chamber, squish set during the dynamometrical brake adjusting, re-calculated linings and cooling surfaces, made of high silicon content aluminium, pressure melted, worked on highest precision working centres, with anti-detonating and anti-oxidationtreatment on the surface.