Vespa PK S Automatic 125 [1984-1989] - crankshaft with pin ø 15, rod 97, stroke 51 mm and reed valve and cone ø 20

MALOSSI crankshaft for Vespa PK S Automatic 125

The MALOSSI crankshaft is designed for power transmission in the Vespa engine. It guides the movement of the connecting rod and piston and supports the tuning of the inlet via the diaphragm valve. The full-surface shaft version is intended for engines that have been equipped with a diaphragm valve instead of the original rotary valve.

Technical features

• Pin: ø 15
• Connecting rod: 97
• Stroke: 51mm
• Cone: ø 20
• Version with diaphragm valve
• Hardened and vacuum melted aeronautical grade steel
• Connecting rod with “viper head”
• Tungsten inserts for balancing support

The material selection is designed for high resistance to scratches. A finer thread on the drive side axle increases resistance. The revised position and design of the key additionally supports the resilience of the thread area. Specially designed nuts complement the robust design.

Vehicle assignment

Suitable for the Vespa PK S Automatic 125 in the full year range 1984–1989.

Important note

The product is intended exclusively for competitions at the designated locations in accordance with the regulations of the relevant sports authorities. It must be used in accordance with the intended purpose.