Rear spring variator Polini with a diameter of 3.8mm (+40%) for Aprilia / Minarelli / Yamaha 50cc 2-stroke scooters.
Technical specifications:
- original spring load: 45/20mm/kg
- Polini spring load: 45/28mm/kg
- spring wire thickness: 3.8mm
- spring length: 106mm
- inner diameter: 46mm
- number of coils: 6.
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