5317510 crankshaft malossi rotary valve vespa cosa 125 2t stroke 57 - sp.15 - connecting rod 105

STRENGTH AND RESISTANCE

MALOSSI CRANKSHAFTS FOR VESPA

The Vespa crankshaft is one of the most delicate and important components of this type of engine, having to both manage the movements of the connecting rod and piston, and regulate the admission through the timing of the half-shoulder.

The Malossi technical office has focused its attention precisely on these two aspects, creating two versions of crankshaft and developing new solutions of great technical value, starting from the choice of materials, as always of the highest quality.

All Malossi crankshafts for Vespa are made of aeronautical quality casehardened steel and vacuum remelted, a material highly resistant to scratches, guaranteed by the certifications required by the very strict Malossi specifications. The "viper head" connecting rod has a shape designed to keep weight to a minimum and guarantee all the necessary rigidity.

Not even the smallest detail has been overlooked. In fact, Malossi technicians, even by intervening on the thread of the TRANSMISSION side of the crankshafts, have managed to significantly increase resistance by using a finer pitch. The position of the key has also been revised in both size and shape, so as not to damage the thread anymore and contribute to resistance in a finally cutting-edge solution. The crankshafts are supplied with special nuts, much more resistant, to exploit the greater resistance offered by the thicker thread.

DIFFERENT VERSIONS

Crankshafts with different connecting rod lengths are available for “small frame” Vespas on which the full shoulder crankshaft will be installed.

The shaft dedicated to engines with rotary valve admission has a standard stroke and connecting rod length.

ROTARY VALVE CRANKCASE SHAFT

In the version dedicated to rotary valve engines, the intake phase was obtained inside the half-shoulder, in the circular mass structure itself, which produced a notable inward-facing slot, while maintaining a regular external profile. This innovative choice made it possible to obtain a unique shape capable of guaranteeing extremely effective fluid dynamics.

Such large slots have always been one of the most delicate points of Vespa crankshafts, when looking for the correct balance. Malossi has solved this problem by including inserts made of tungsten in the crankshaft and used as counterweights to increase the stability of the shaft itself.
Compatibility Table

VESPA COSA 125 2T
VESPA COSA 150 2T
VESPA PX 125 2T euro 0-1
VESPA PX 125 2T euro 2 (VLX2M)
VESPA PX 125 2T euro 3
VESPA PX 150 2T euro 0-1
VESPA PX 150 2T euro 2 (VLX2M)
VESPA PX 150 2T euro 3
Code: 5317510
The Product may be reserved exclusively for competitions in places specially designated for such purposes according to the provisions of the competent sports authorities. We decline all responsibility for improper use.
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