Polini 78.8cc Big Bore Kit | Vespa Piaggio 4T 50cc Engines 1000-1356 Mounting hardware for Prima windscreens

Mounting hardware for Prima windscreens 0700-1004 and 0700-1005

Tech Tip: For most 50cc Minarelli engines

rips and tears before riding

Vespa ET2 Vespa ET4 About Prima: Prima is the industry leader in premium scooter accessories

NCY Racing Clutch & Bell: High-friction clutch shoes and a vented bell provide maximum grip and heat dissipation

Polini 78.8cc Big Bore Kit | Vespa Piaggio 4T 50cc Engines 1000-1356 Mounting hardware for Prima windscreensBump your Piaggio 4T 50cc scooter to 78. 8cc with the Polini Big Bore Kit. Designed for 4 stroke 2 valve and 4 valve 49cc Piaggio engines, this complete kit includes a finned aluminum alloy cylinder, flat top piston, full gasket set, and all hardware needed for the bore up. The 11. 6: 1 compression ratio delivers a significant increase in mid range and top end power, and the included gear up ratio (14: 43) provides a 60% increase over stock (11: 54)