Vespa Primavera ET 3 [1976-1983] - crankshaft with pin ø 15, rod 97, stroke 51 mm and reed valve and cone ø 20

MALOSSI crankshaft for Vespa Primavera ET 3

The MALOSSI crankshaft is intended for the Vespa Primavera ET 3 in the full year range from 1976 to 1983. It combines defined dimensions with a design for engines that have been converted with a diaphragm valve instead of the original rotary valve.

Function and execution

The crankshaft guides the connecting rod and piston and at the same time influences the inlet into the crankcase. The full collar design supports the intake of fresh gases into the lower housing through specially designed bevels on the rear of the drive side. An optimal balance is supported by tungsten inserts.

Technical data

• Connecting rod length: 97 mm
• Stroke: 51mm
• Pin: ø 15
• Cone: ø 20
• Version with diaphragm valve
• Full collar crankshaft
• Material: hardened, vacuum melted, aeronautical grade steel

Vehicle assignment and installation instructions

The vehicle assignment is Vespa Primavera ET 3, built between 1976 and 1983. A separately available kit is required for installation in this vehicle. In addition, the crankshaft seat on the ignition side of the engine housing must be drilled to ø 87. The crankshaft is intended exclusively for competitions in the designated places in accordance with the regulations of the relevant sports authorities.