Name Polini Torque Spring + Evo Slider 3.9mm Piaggio NRG / Typhoon Item No. U243.090 Brand Polini Diameter 107 mm
Polini Torque Spring + Evo Slider Piaggio NRG / Typhoon, 50/20mm/kg = extra soft, diameter = 3.9mm. The spring comes with an "Evo Slider" spring seat.
Torque springs are quite important when it comes to adjusting your transmission. They put pressure on the rear pulley and influence belt tension and clutch performance. Softer springs mean less belt tension and are suited for lower rpm engines, stiffer springs mean more belt tension and are recommended for tuned engines with higher rpm range. Keep in mind that after changing the torque spring you'll likely have to change the variator weights as well to reestablish a balanced system.
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