Vespa Primavera ET 3 [1976-1983] - crankshaft with pin ø 15, rod 105, stroke 51 mm and cone ø 20 for engines with reed valve

MALOSSI crankshaft for Vespa Primavera ET3

This MALOSSI crankshaft is designed as a solid crankshaft for engines with a reed valve intake system. It replaces the version intended for a rotary valve inlet and is aimed at modified Vespa engines. The design supports the power transmission between pistons, connecting rods and crank drive.

Technical features

• Pin: ø 15
• Bar length: 105
• Stroke: 51mm
• Cone: ø 20
• Version for engines with reed valve
• Solid crankshaft with balanced mass structure
• Reinforced aviation grade steel, vacuum cast
• “Viper Head” connecting rod to combine low weight with the required rigidity

Vehicle assignment

The crankshaft is the Vespa Primavera ET3 in the full year range 1976–1983 assigned.

Execution and use

Tungsten inserts help balance the crankshaft. The specially designed bevel on the crank web area on the transmission side makes it easier to absorb fresh gas under the oil pan with the diaphragm valve configuration. This means that this version is specifically tailored to the corresponding engine structure.

The product is intended exclusively for racing at designated locations in accordance with the regulations of the relevant sports authorities. Before assembly, the existing motor configuration and the required processing steps must be checked. Assembly instructions are available for professional installation.