Vespa PK XL 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 XL 125 with reed valve

The MALOSSI crankshaft is intended for the Vespa PK XL 125 from the 1983-1991 model year range. It was developed for engines that have been converted to a diaphragm or reed valve intake system instead of the original rotary valve.

Function and construction

As a central component of the crank mechanism, the crankshaft transmits the movement between the connecting rod and piston and supports the crankshaft control of the inlet. The design uses reinforced aviation grade steel and is vacuum cast. The specially designed connecting rod geometry combines reduced weight with the required rigidity.

Tungsten inserts help balance the complete crankshaft. A specially designed bevel at the transmission-side end of the crank makes it easier to absorb fresh gas under the oil pan.

Technical data

• Pin: ø 15
• Bar length: 105
• Stroke: 51mm
• Cone: ø 20
• Version for engines with reed valve

Vehicle assignment and installation instructions

Suitable for Vespa PK XL 125, built between 1983 and 1991. The spacer kit 0717472 is required for installation and is available separately. The crankshaft seat on the ignition side of the engine housing must be drilled to Ø 87.

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