MALOSSI CAST IRON 75 cc CYLINDER KIT Ø 47 - VESPA 50

This Malossi cast iron cylinder with a 47 mm diameter piston and 75 cc displacement is interchangeable with the original cylinder fitted on Vespa 50 N, 50 L (Lusso), 50 R (Rinnovata), 50 Special, 50 Revival, 50 PK, 50 PK S, 50 PK XL and Ape 50.
Compared to the original cylinder, this kit features revised transfer ports, designed to provide improved engine responsiveness and a livelier performance, delivering increased power.

Vespa 50 and Ape 50 are originally equipped with a 43 mm stroke crankshaft, and this engine kit can be installed without replacing the original crankshaft. The kit is supplied complete with cylinder head and gaskets, ready for installation, and does not require specific technical skills or machining, making it easy to fit on all Vespa models.

Performance can be further enhanced by replacing the original crankshaft (which remains suitable) with a racing crankshaft. The main characteristics of this cylinder are high torque output and reduced fuel consumption.
The machining carried out by Malossi technicians results in exceptional robustness, ensuring superior performance across all engine speed ranges.

Further upgrades can be achieved by fitting a larger carburetor, variable-advance electronic ignition, longer gear ratios, a reinforced clutch and a suitable exhaust system. For any information, do not hesitate to contact the Emporio dello Scooter customer service, which will be happy to help identify the ideal configuration for your application.

This product is intended for racing and sporting use, therefore for track use only and not for public road circulation.

Cylinder

• Material: special self-lubricating, wear-resistant cast iron alloys with a very high refinement level, obtained by gravity casting using the Shell Moulding process.

• Machining: high-precision CNC machine tools.

• Recalculated and increased heat exchange surfaces.

• Exhaust ports and transfer ports designed and optimized for maximum thermodynamic efficiency.

• Dimensional and surface roughness inspections according to Malossi standards.

• 100% piston-to-cylinder matching with selections of 0.010–0.005 mm.

• 100% hydraulic sealing checks.

Piston

• Material: special high-silicon aluminum alloy with low thermal expansion.

• Machining: CNC machines.

• Lightweight and reinforced design.

• Increased heat exchange surfaces.

Piston Rings

• High-strength spheroidal cast iron piston rings.

Cylinder Head

• Material: special die-cast aluminum alloy.

• Recalculated and enlarged heat exchange geometry.

• CNC machining with ultra-precise diamond tools.

• Anti-oxidation surface treatment.

• Compression sealing with Viton gasket.

• Hemispherical combustion chamber with squish band and centrally positioned spark plug.

For Vespa 50 – 75 cc – Ø 47.0 mm, cast iron, 6 transfer ports, 43 mm stroke, supplied complete with cylinder head and exhaust studs.

Use on vehicles operated on public roads is permitted only if compliant with applicable regulations and the vehicle’s homologation specifications. Otherwise, the product must be considered intended for non-road use.