Vespa PK S Automatic 125 [1984-1989] - crankshaft with pin ø 15, rod 105, stroke 51 mm and cone ø 20 for engines with reed valve

MALOSSI crankshaft for Vespa PK S Automatic 125

The MALOSSI crankshaft is designed for the Vespa PK S Automatic 125 from the 1984-1989 model year range. This version was developed for engines with a diaphragm valve intake system and supports the reliable implementation of the movements of the connecting rod and piston.

Version for diaphragm valve motors

As a solid crankshaft, it has a specially designed bevel on the gearbox side. This design makes it easier to absorb fresh gas under the oil pan. Tungsten inserts contribute to the balanced crankshaft design. The circular mass structure is tailored to the combination of wave and sump configuration.

Technical data

• Pin: ø 15
• Bar length: 105
• Stroke: 51mm
• Cone: ø 20
• Material: reinforced aviation grade steel
• Production: cast in vacuum
• Connecting rods in “Viper Head” shape to reduce weight while maintaining rigidity

Vehicle assignment

Suitable for Vespa PK S Automatic 125, built between 1984 and 1989. The version is intended for engines with a diaphragm valve intake system.

Note on use

The product is intended exclusively for racing in specially designated locations in accordance with the regulations of the relevant sports authorities. Improper use is excluded.