Vespa Primavera 125 [1967-1975] - crankshaft with pin ø 15, connecting rod 97, stroke 51 mm and rotating valve and - cone ø 20

MALOSSI crankshaft for the Vespa Primavera 125

This MALOSSI crankshaft is designed to drive the Vespa Primavera 125 with a rotating valve. It connects the guidance of the connecting rod and piston with the control of the intake via the crankshaft and thus forms a central component of the engine.

Design and function

In the version for engines with a rotating valve inlet, the intake phase is integrated into the half crank. The inwardly inclined design within the circular mass structure supports efficient fluid dynamics. For balancing, tungsten parts are used as counterweights, which contribute to the stability of the shaft.

Technical data

• Bolt ø: 15
• Connecting rod: 97
• Stroke: 51mm
• Design: rotating valve
• Cone ø: 20
• Material: reinforced aviation grade steel
• Production: cast in vacuum
• With special nuts for the reinforced thread on the gearbox side

The shape of the connecting rod is designed for low weight with the required rigidity. The thread on the gear side has a smoother gradation; The position, size and shape of the wedge were also tailored to the load capacity of the construction.

Vehicle assignment

The crankshaft is for the Vespa Primavera 125, built between 1967 and 1975, provided.

Important note

This product is intended exclusively for racing in specially designated locations in accordance with the regulations of the relevant sports authorities. No liability is assumed for improper use.