POLINI blue contrast spring D.4 Ciao/Si

The POLINI blue contrast spring D.4 is an essential component for the proper functioning of the variator group, particularly in situations of high power increase. This spring is designed to improve the response of the rear movable half-pulley, reducing the risk of belt slippage, which can occur after the installation of powerful transformation kits.

With an increased load of 10% for MaxiScooters, 7% for 50cc Scooters with a white spring, and 15% for 50cc Scooters with a blue spring, this spring offers an effective solution to optimize vehicle performance. It is important to note that the use of springs with a higher load must be carefully evaluated, as excessive load can compromise transmission efficiency and increase belt wear.

Additionally, the spring is equipped with EVO SLIDER, a special wear-resistant and self-lubricating material that ensures smooth and consistent movement during the variator shift excursion. Before proceeding with the replacement, it is advisable to check the condition of the belt and the proper functioning of the entire variator group to ensure optimal installation.

• Increased load of 10% for MaxiScooters
• Increased load of 7% for 50cc Scooters with a white spring
• Increased load of 15% for 50cc Scooters with a blue spring
• EVO SLIDER wear-resistant and self-lubricating material
• Optimization of the response of the rear movable half-pulley
• Reduction of the risk of belt slippage
• Recommended to check the condition of the belt and the variator group before installation