Cylinder kit malossi mhr 136cc aluminium for Vespa 50/90/125 Primavera/ET3/PK

Cylinder kit malossi mhr aluminium for vespa 50/90/125 primavera/et3 Diameter 57.5, piston with one rectangular segment malossi is proud to introduce to its public the total renewal of a real legend, one of the most long-lived and successful projects ever linked to our trade mark: the new and amazing cylinder for vespa et3 125. this time wholly aluminium made. the story of this cylinder kit starts in 1982 when, for the first time in a cast iron cylinder with this ring, an oring is used as seal gasket between head and cylinder: a refined solution representing so far the state of the art. malossi has rewritten its project on a blank sheet, drawing it up new from the roots, thus renewing and releasing a cylinder which rightfully joins the famous range of mhr cylinder kits. aluminium has replaced cast iron and the reed valve seat has been totally redesigned, a real revolution able to fill the gaps of the original vespa intake already since 1982 and now equipped with a cross bar in order to grant higher stability to the piston ring. displacement increases to 130cc, whereas the six ports are the result of the know-how and technology gained during decades of scooter races. now, for the first time in the history, they are fitted on a vespa cylinder which can reach very high performances and revolutions up to 11.000 rpm. the exhaust system as well has been completely renewed and it is equipped with a booster now, a racing solution which grants a wide expulsion surface of the burnt gases, thus reducing the piston ring wear. malossi philosophy has always been to supply a "plug and play", complete and powerful kit. therefore, the complete new edition of the reed manifold block specific for this cylinder kit could not be missing (code = 2016319 - only for vespa et3 primavera). thanks to a considerable number of studies and fluid dynamics simulations created using futuristic software, manifolds have been perfectly machined so as to obtain an almost straight system, able to ensure the optimal passage from carburettor to intake, while perfectly remaining inside the vespa side panel. the piston is brand new as well, specifically designed for this cylinder, now super light, with one piston ring and very high performances. technical features aluminium cylinder cylinders obtained by gravity die-casting in permanent steel moulds. material: hardened and tempered high silicon content primary aluminium alloy. machining: on numerically controlled high precision machine tools. cylinder liner with silicon carbide metal-spray coating on a galvanic nickel matrix, cross-honed with passes with diamonds for very tight tolerances. recalculated and increased heat exchange surfaces. exhaust and transfer ports designed and tested for maximum thermodynamic performance. dimensional and surface finish quality control performed according to malossi's internal specifications. cylinder and piston coupling 0.005 mm selections