Vespa PK S 125 [1983-1991] - 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 125 with reed valve

The MALOSSI crankshaft is designed for the Vespa PK S 125 from the 1983-1991 model year range and is suitable for engines with a reed valve. Their design supports the conversion from the original rotary valve to a diaphragm valve inlet system.

Technical features

• Pin: ø 15
• Bar length: 105
• Stroke: 51mm
• Cone: ø 20
• Version as a complete crankshaft
• Reinforced aviation grade steel, vacuum cast
• “Viper Head” connecting rod for low weight with the required rigidity
• Tungsten inserts to balance the crankshaft
• Special, reinforced nuts for the optimized thread on the gearbox side

Vehicle assignment

Suitable for Vespa PK S 125, built between 1983 and 1991. The crankshaft is intended for engines with a reed valve and is therefore aimed at correspondingly converted engine concepts.

Execution and use

The specially designed bevel on the gearbox side of the crankshaft makes it easier to absorb fresh gas under the oil pan. The circular mass structure is tailored to the combination of wave and sump configuration.

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