Crankcase Malossi C-One Yamaha Aerox / MBK Nitro

Crankcase Malossi MHR C-One aerox

Malossi has taken the design of performance parts to the next level. The introduction of their Malossi Crankcase Kit C-One has revolutionized scooter tuning by presenting innovative technology ready to house the latest and newest racing components.

Malossi C-One - state-of-the-art racing crankcase

To date, tuners were forced to equip their tuned racing scooters with original or OEM quality crankcases that were designed for limited power and performance. These OEM cases often limit machining options and restrict the installation of high-performance parts. They had to modify these crankcases so they were capable of dealing with the requirements and strain of 70cc and more powerful engines.

Malossi tackled this issue head-on, discarding traditional design constraints and developing the C-One case from scratch. The transfer and intake areas were completely reengineered, and the structural rigidity was significantly improved. 

Special attention was paid to the reed valve area - employing the newest CFD (Computational Fluid Dynamics) software, Malossi engineers were able to calculate and design optimum angles and dimensions for reed valve placement.

They got rid of auto-lubrication and traditional water pump technology in order to minimize power loss, a pre-drilled opening allows for the use of a vacuum fuel pump. The opening for the electric starter was closed. The shock mount has been repositioned and reinforced for better stability.

The C-One for Minarelli is based on the C-One for Piaggio; this means that you'll have to use Piaggio components. You can use standard Yamaha / MBK wheels with disc brake. The crankcase was designed for Malossi MHR cylinder kits.

Technical specifications Malossi C-One Case

• Material: die-cast aluminium silicon alloy
• Weight: 5.15kg
• Spacing crankshaft - primary shaft: 270mm
• Stud bolt spacing: 48x48mm
• Crankshaft bearing: 20x47x14mm
• Wheel axle bearing: 20x47x14mm
• Needle cage for transmission cover: 16x22x12m
• 360° manifold for VHST and PWK carburetors
• Reed valve: VL18
• Cylinder base seat: 57.5 mm
• Pump casing bore: 73mm
• Stud bolts: 8.8 tempered steel
• Suitable for: Minarelli horizontal long