For Yamaha, Minarelli and PGO Horizontal 50cc Two Stroke Scooters. Fits OEM and Malossi cylinders.
H.T.S.R. HEAD (High Turbolence Squish Racing) Heads with high turbolence concentric combustion chamber, squish setduring the dynamometrical brake adjusting, re-calculated linings and coolingsurfaces, made of high silicon content aluminium, pressure melted, workedon highest precision working centres, with anti-detonating and anti-oxidationtreatment on the surface.
was 389782