Malossi MHR Racing 70cc Performance Cylinder Kit for Yamaha Aerox 50


Race level performance for the road.

The Malossi MHR Racing cylinder kit offers unparalleled performance, bred from Malossi’s years of dominance in scooter racing.

This kit comes with all the bells and whistles, including special aluminium alloy with high silicon and titanium mix for incredible strength and durability even at high temperatures, Nikasil bore for an almost indestructible inner surface coating, single ring piston made from the same aluminium/silicon/titanium alloy as the cylinder with an additional graphite coating for a very low friction coefficient, and to top it off this kit also comes with a set of varying thickness base gaskets for adjustable squish (compression) for the optimum compression ratio.

All these small differences together make a big difference to the power figure. Malossi say this cylinder is capable of a whopping 22hp when paired with a mid-race exhaust, high compression crank and upgraded carb setup.

This kit can only be paired with the Malossi MHR crank (Click here to view). It is no suitable with the factory crank. This kit comes with a 12mm piston.

We recommend installing this cylinder with either a Tecnigas TRIOPS, or  Yasuni C16.

In Stock at Euro Warehouse (Ships in 8-12 days)

SKU: M318460 Categories: ,




  • Material: special aluminium alloy with high percentage of silicon and titanium that guarantees exceptional strain strength even at high temperatures.
  • Heat treatment: special quenching and stabilizing treatment that gives the material increased toughness and strength, guaranteeing that mechanical and size specifications will remain unaltered for temperatures of up to 250 °C.
  • Chip-forming machining: carried out on NC machining centres with extremely-limited size and shape tolerance (roundness, perpendicularity).
  • Inner surface coating: effected using silicon carbide on a nickel matrix with heat treatment that guarantees extreme hardness (around 600 HVO, 1/5) and excellent resistance to wear.
  • Internal machining of cylinder: using special machines that allow a degree of finish on the cylinder barrel walls whose roughness corresponds with the angles set at the design stage (grinding process using special stone).
  • Port and exhaust diagrams: designed and manufactured especially for racing. The definition of the port and exhaust diagrams has requested considerable effort on the part of our engineers both on engine test stands and the circuits on which the trophy is held.


  • Material: special aluminium alloy with a very high percentage of silicon and titanium that guarantees both excellent heat resistance and strain strength upon temperature variation.
  • External coating: graphite coating that guarantees a very low friction coefficient
  • Structure: reinforced in order to offer resistance to the stress suffered by cylinder units used for top-level competition, but at the same time light enough to reduce inertial force.
  • Ring: 1 mm nodular-cast-iron single ring with rectangular cross section and hard-chromium coating on outer surface.


  • Rings in very strong modular cast iron with ground, wear-resistant, hard chrome metal-spray coating on the contact surface.


  • Material: special alluminium alloy with a very high heat exchange coefficient.
  • Geometry of heat exchange surfaces recalculated and increased.
  • Combustion chamber completely-designed to obtain a high compression ratio with a very high turbolece.
  • Machining: numerically controlled machines.