MALOSSI V-One crankcase, valve intake - Vespa PX125-150 with electric start

Description

Malossi's technical and technological advancement is the greatest strength of our products, which is why we are convinced that we have created one of the best crankcases ever produced. Strengths Every square millimetre of the crankcase reveals an innovative drive that is evident even to the most inexperienced tuner. The gravity shell casting, which distinguishes these crankcases from the original models obtained through a die-casting process, combined with the use of modern shell moulding cores, allows for better internal shapes to be achieved with maximum precision. Gravity casting has allowed us to strategically increase the sections in the areas subject to the greatest stress and to subject the casings to a heat treatment after casting, thus achieving very high mechanical strength. These products are made from a high-quality Al Si 7 Mg (EN AB and AC 42000) light aluminium alloy containing the right amounts of silicon to increase mechanical strength, manganese for improved resilience and corrosion resistance, and copper and magnesium to improve workability. The casings are machined entirely in our workshop using CAD/CAM processes and high-precision CNC machining centres. All contact and sealing surfaces are machined with diamond tools to ensure extremely low surface roughness values and virtually perfect couplings. Advantages Both casings share a number of basic features, such as a front arm reinforced with stress relief ribs and sections with a profile calculated to allow the correct flow and channelling of stresses and ensure better resistance. Both models feature pins for the brake shoes, which are installed directly in-house using presses capable of applying the forces required to achieve the couplings specified by our designers. In addition to the brake shoes, the casings are supplied with the M7 stud bolts required for mounting the gear selector. Finally, no version excludes the original electric starter, whose actuator can be mounted in the special recess in the volute. Fluid dynamics have finally been implemented! Equipping our standard models with transfer bags that are suitably profiled and sized to fit perfectly with our Ø 63 cylinders, without excluding the possibility of mounting other thermal units and, in fact, offering increased performance even with the latter, frees tuners from having to machine the casings to mount higher performance cylinders. The M7 stud bolts for mounting the cylinders are also included in the package! Thanks to the measures listed above, achieving higher power is no longer a problem. Even the usual problem of oil leaking from the crankcase has been solved thanks to: Increased thickness of the pump crankcase walls, which also contributes to the mechanical strength of the crankcase Use of M8 stud bolts to replace the original M7 bolts High-precision machining of the sealing surfaces. We have eliminated the crankcase gasket, which deteriorated and was the main cause of oil leaks. Now the crankcases are perfectly coupled and sealed with gasket paste, which is resistant even to the highest operating temperatures!