Polini Performance Transmission Kit for Piaggio 50cc 4 Stroke Scooters. This kit is designed to improve acceleration on stock, untuned scooters.Includes Variator, Ramp Plate, Slides, Variator Boss, Roller Weights in 4.7g, Clutch Springs and Torque Spring. Fits the following 4 stroke models:
- Piaggio Fly 50, Zip 50
- Vespa ET4, LX50, Primavera 50
- Aprilia: Scarabeo, Sport City One 50
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