Malossi Torsion Controller for Vespa 150-300 and Piaggio 125-300 engines.

This ring goes at the bottom of the large clutch spring and allows more of the engine's torque to get to the back wheel. It has been proven in racing applications throughout Europe. This smooths out the ride, and eliminates a lot of the high speed vibration that occurs in the clutch. This will usually solve your clutch judder problem. 

TORSION CONTROLLER

Antifriction fifth wheel for variator contrast spring

A secret from Malossi racing department
Light, perfect: a technology extract in its simplicity; design and formula of the materials are registered.

Abstract from of Malossi Engineering R& D department archives
CVT Transmission systems.
Chapter : contrast spring.
Goal
Pull down vibrations and to make the system operation stable at any rpm and temperature.

Design path
We have considered both on theoretical and practical basis all the existing fifth wheel systems: balls, rollers and radial sliding fifth wheels of metal type. All the tests gave unsatisfactory results. We have made prototypes with alternative systems, metallic type, without any positive results. Only after exhausting laboratory and racetrack tests we have eventually come to Torsion Controller design.

Thesis
The above-mentioned component solves the following problems.
During gear curve range the bushing of the movable pulley (torque drive) slides into the driven pulley in axial way along fixed pulley hub, making a small rotation which gives a torsion to the contrast spring. Sometimes the spring loses its position while frictioning on the shoe-holder plate, metal against
metal; some others, the spring remains stuck in its position causing some accidentally different contrast forces.
Second problem: centrifugal forces caused at high rpm affect the spring which consequently buckled and starts to veer as to create big vibrations, very annoying for the driver as well as dangerous for the engine and, above all, making unsteady the gear curve.

Result
We approved the project with great success after strict tests at R & D department and on racetrack on all examined scooter models. 

APRILIA APRILIA ATLANTIC 200 

APRILIA APRILIA MOJITO 125

APRILIA APRILIA SCARABEO 125 

APRILIA APRILIA SCARABEO Light 200 

APRILIA APRILIA SCARABEO 250 4T LC (PIAGGIO M285M)

APRILIA APRILIA SCARABEO Light 250

APRILIA APRILIA SPORTCITY 125

APRILIA APRILIA SPORTCITY 250

ITALJET ITALJET TORPEDO 125 4T (LEADER)

PIAGGIO PIAGGIO BV 200 

PIAGGIO PIAGGIO BV 250

PIAGGIO PIAGGIO FLY 150 

PIAGGIO PIAGGIO LT 150 

PIAGGIO PIAGGIO MP3 250

PIAGGIO PIAGGIO TYPHOON 125

VESPA VESPA ET4

VESPA VESPA Granturismo

VESPA VESPA Granturismo L -

VESPA VESPA GT 200

VESPA VESPA GTS 250

VESPA VESPA GTV 250

VESPA VESPA GTS 300

VESPA VESPA GTV 300

VESPA VESPA LX 150

VESPA VESPA LXV 150

VESPA VESPA S 150