torque spring Polini +15% for Piaggio 125-180cc 2-stroke P.20661 fitting for Aprilia SR Racing 125 PXA00 2001, 13,3 PS, 9,8 kw

These Polini counterpressure springs increase pressure by 15%, making them ideal for light tuning. When the level of tune increases, so too should the strength of the springs. Variator must be calibrated if springs are changed.

• Original Spring Loading: 70/36mm/kg
• Polini Spring Loading: 70/42mm/kg
• Spring Thickness: 4.7mm
• Spring Length: 170mm
• Inside Diameter: 55.5mm
• Number of Turns: 7