POLINI Contrast Spring D.4.5 Evo-Slider PIAGGIO

The POLINI D.4.5 Evo-Slider contrast spring is an essential component for optimizing the performance of the variator in two-wheeled vehicles. Designed to ensure a quick and precise response, this spring is particularly useful in high-power situations, where engine modifications can cause belt slippage. It is important to note that when used on Yamaha engines, it must be paired with the Polini Speed Drive.

The supplied springs offer an increase in load compared to the stock ones: 10% for the blue model (MaxiScooters), 7% for the white model (Scooters 50), and 15% for the blue model (Scooters 50). The Evo Slider, made with special wear-resistant and self-lubricating material, allows the spring to slide consistently, improving the efficiency of the transmission system.

Before proceeding with the spring replacement, it is crucial to check the wear condition of the belt and ensure that the entire variator assembly is functioning correctly. This ensures that optimal performance is achieved by using the spring with the lowest load that allows for optimal power transmission.

• Model: POLINI D.4.5 Evo-Slider
• Load increase:
  • 10% - Blue model (MaxiScooters)
  • 7% - White model (Scooters 50)
  • 15% - Blue model (Scooters 50)
• Material: special wear-resistant and self-lubricating
• Optimization of variator performance
• Quick and precise response
• Recommended use with Polini Speed Drive on Yamaha engines
• Belt wear condition check required before replacement