torque spring Polini Evo-Slider +87% for Minarelli 243.104 fitting for Aprilia SR Ditech Street 50 TE000 2005, 5,4 PS, 4 kw

Polini springs that increase pressure by 87% 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: 45/20mm/kg. Polini spring weight: 45/37.5mm/kg. Spring thickness: 3.8mm. Total length: 106mm. Internal diameter: 46mm. Number of coils: 5.