Vespa V50-125 Prim ET3 PK S/XL MALOSSI 136cc MRH Alloy Cylinder Kit

• aluminium
• 6 ports
• Ø 57,5mm
• stroke 51mm
• pin 15mm
• with cylinder head
• M6 exhaust studs, direct or crankcase intake

MALOSSI small frame tuning – the next generation! Close on the heels of the 136cc MK II cylinders release the Italians follow it up with the MALOSSI Hyper Racing (MHR) version of their smallframe mainstay. An aluminium cylinder, new barrel-mounted inlet manifold, bridged exhaust port, new piston equipped with just one piston ring and monster transfer ports you could lose things in! This version is MALOSSIs ticket to the premier direction of smallframe racing - Hyper Racing.

Similar to previous versions, this cylinder is compatible with all Vespa 50-125/PK50-125 models, with both conventional disc-valve or reed valve inlet manifold systems. To enable this a suitable inlet cover is included with the kit. To make use of the cylinder mounted reed-valve intake the manifold from the MK II cylinder can also be used. The mounting studs are identically spaced, although the cylinder itself will require slight modifications below the first cooling fin. Otherwise MALOSSI also produces suitable manifold for the 136cc MHR cylinder. The right angle at which the petals were positioned, in relation to the cylinder, has been changed to a slight angle. This allows a much improved gas flow (fluid dynamics) of the fuel charge mix.

Alongside the massively increased size of the transfer ports the port timings and inlet port angle have also been redesigned on the MK II version. The most noticeable novelty in the area of the exhaust outlet is the new bridged port design. The inlet port is divided into two stabilising the single-ringed piston in this area.