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- POLINI High-Speed Variator for Vespa Primavera 125 (2013–), Sprint 125 (2014–), LT 125 (2014), and Piaggio Liberty 125 (2013–2024)
More punch from a standstill, powerful acceleration and gearing that continues to perform at higher speeds: the Polini High-Speed sports variator gives the 125cc three-valve engine of the Vespa Primavera, Sprint and Piaggio Liberty a sportier transmission character. Instead of simply managing the available engine power, the specially developed CVT variator makes more effective use of the engine's potential.
Polini relies on a carefully engineered overall concept combining an enlarged variator diameter, specially designed roller tracks and a friction-optimized variator bush. The goal: immediate response, dynamic acceleration and continuous power delivery across the widest possible speed range.
The heart of the Polini High-Speed variator is its enlarged design compared with the standard transmission. While the original variator has a diameter of 108 mm, the Polini High-Speed operates with a diameter of 118 mm.
This difference is crucial. The larger diameter allows the drive belt to use an extended operating range. This increases the potential transmission ratio range of the continuously variable CVT system.
The advantages become apparent in different riding situations:
A sports variator does not increase the engine's actual power output. Instead, it changes how effectively the available power is transmitted to the rear wheel via the drive belt. Especially on a 125cc four-stroke engine, optimized gearing can make a noticeable difference in response and acceleration.
Polini supplies the High-Speed variator together with a specially matched front pulley. There is a good reason for this: because of the increased variator diameter, the opposing pulley also needs to match the modified geometry.
The coordinated components allow the drive belt to make use of the extended transmission ratio range. The front pulley features a large, evenly machined running surface as well as pronounced cooling fins.
The variator body also displays Polini's characteristic technical approach. Its distinctive ribs, precisely machined surfaces and specially shaped roller tracks make it clear that this is not simply a copy of a standard component. The entire construction is designed around the modified operating characteristics of the High-Speed transmission.
A special technical feature of this Polini High-Speed variator is the variator bush. Polini uses a specially treated version with a DLC coating (Diamond-Like Carbon).
This particularly low-friction surface treatment is also used for highly stressed sliding components in motorsport and aviation. It reduces friction between moving components and helps support precise operation of the variator.
The design also features an integrated lubricant reservoir. A special spring helps continuously distribute the grease across the sliding surface. This is intended to ensure reliable lubrication even under high loads.
The required grease is already included in the package. Polini therefore not only provides sports-oriented gearing but also takes the mechanical requirements of the variator drive into account.
The set includes a complete set of Polini variator rollers measuring 19 x 17 mm and weighing 12.3 g each.
The black rollers feature metal inner bushes and carry the Polini logo as well as the weight marking. They are matched to the operating characteristics of the High-Speed variator.
The variator weights have a major influence on the engine speed at which the transmission ratio changes during acceleration. With the correct setup, the engine can be kept as effectively as possible within its usable power range.
As a general rule, lighter rollers tend to produce higher engine speeds during acceleration, while heavier rollers change the transmission ratio at lower engine speeds. However, the decisive factor is always matching the setup to the actual power characteristics of the engine.
The Polini High-Speed variator impresses not only with its modified transmission ratio. The individual components also demonstrate a design consistently focused on function.
The high-gloss ramp plate features the embossed Polini lettering. Its characteristic shape works together with three black sliding elements that guide the movement of the ramp plate.
The metallic variator components feature precisely machined contact surfaces. Together with the specially treated variator bush, matched rollers and supplied lubricant, they form a complete transmission system with components designed to work together.
Suitable for the corresponding air-cooled 125cc three-valve engines. Check the installed engine version before ordering.
For optimum operation, the variator components must be installed according to the manufacturer's specifications. The supplied grease should only be applied to the designated areas. In particular, the drive belt running surfaces must remain free of grease.
The actual acceleration characteristics and achievable top speed depend, among other factors, on engine condition, drive belt, roller setup and vehicle configuration.
Whether pulling away quickly from the lights, accelerating out of a bend or riding over longer distances: the Polini High-Speed variator brings a new level of dynamics to the 125cc transmission. Its particular appeal lies in the combination of an extended transmission ratio range, friction-optimized technology and carefully matched components.
With its 118 mm variator diameter, DLC-treated variator bush and complete High-Speed front pulley, Polini offers a technically sophisticated solution for riders looking to get more riding enjoyment from their Vespa Primavera, Sprint or Piaggio Liberty. Sports CVT technology from Italy, developed for a more lively riding experience.
