Vespa PK S 125 [1983-1991] - crankshaft with pin ø 15, rod 97, stroke 51 mm and reed valve and cone ø 20

MALOSSI crankshaft for Vespa PK S 125 with diaphragm valve

This MALOSSI crankshaft is designed for the Vespa PK S 125 from the 1983-1991 model year range. It combines the precise guidance of the connecting rod and piston with the control of the inlet and is suitable for engines with a diaphragm valve.

Function and execution

The crankshaft has a full collar and is intended for Vespa engines with a diaphragm inlet instead of an original rotary valve. The specially shaped slopes on the drive side support the intake of fresh gases into the lower engine housing. Tungsten inserts are used to balance the shaft.

Technical data

• Manufacturer: MALOSSI
• Pin: ø 15
• Connecting rod: 97
• Stroke: 51mm
• Cone: ø 20
• Version: Crankshaft with full collar and diaphragm valve
• Connecting rod with “viper head”
• Material: Hardened, vacuum melted, aviation grade steel

The steel used is designed for high scratch resistance. Threads, key position and special nuts in this crankshaft design have been tuned for increased resistance.

Vehicle assignment

Suitable for Vespa PK S 125, built between 1983 and 1991.

Factual note

The product is intended exclusively for competitions at the designated locations in accordance with the regulations of the relevant sports authorities. No liability is assumed for improper use.