torque spring Polini Evo-Slider +28% for Piaggio 243.105 fitting for Aprilia SR Ditech Racing 50 RLB10 2003, 4,5 PS, 3,3 kw

Polini springs that increase pressure by 28% and is therefore ideal for tuned engines. The springs press the gear on the rear converter onto the belt. It also creates pressure to shift the variator. A lighter pressure is required once a motor has been tuned to prevent the engine from moving into a dangerously high rev range. The pressure of the springs is closely tied to the variator. If a spring is fitted, it must be matched to the variator. Original spring weight: 50/28mm/kg. Polini spring weight: 50/36mm/kg. Spring thickness: 4.6mm. Total length: 90mm. Internal diameter: 48.5mm. Number of coils: 5.5.