Polini Big Bore Kit; 4T Vespa Primavera, LX 50, Fly 50 & P50 rainfly a new notched Kevlar Belt

a new notched Kevlar Belt has been introduced with larger section and revised length to ensure maximum performance under all running conditions

radius-ground and edge-trimmed for a perfect

Exhaust Port: 22mm

We recommend careful tuning

Polini Big Bore Kit; 4T Vespa Primavera, LX 50, Fly 50 & P50 rainfly a new notched Kevlar BeltPolini big bore kit for four valve, 4T, 49cc Piaggio engines including modern Vespa LX 50, Primavera 50, Fly 50, and the P50 Scootcoupe vehicles. This kit increases the displacement to 78. 8cc! Specifications: Aluminum alloy cylinder Displacement increase: 78. 8cc Compression ratio: 11. 6: 1 Gear up ratio: 14: 43, 60% increase over stock 11: 54 Includes everything in the photo Compatibility: Vespa LX 50 (2006 2009) 4 Stroke 2 Valve Vespa LX 50 (2010