KEIHIN NCV20 AR3 carburetor for Vespa LX/S/Primavera for Vespa LX/S/Primavera/Sprint 50cc, 4-stroke, AC, 4-valves engine connection: 28 mm, air filter connection: 38mm, main jet 72, secondary jet 35, incl. chokeautomatic If the carburetor is beyond repair, then it requires replacement with a new element. We have the original carburettors, equipped with PIAGGIO, for each Vespa model available in stock. Keihin CVKs are used by PIAGGIO for all their modern four-stroke Vespa engines. By contrast, they mostly use DELLORTO PHVA carburetors for their modern two-stroke models. If the two-stroke has a different brand of carburettor originally fitted, the DELLORTO item is fully compatible for use. All carburetors are supplied fully assembled and include an electrically operated choke mechanism. SIP-TIP: Always use the correct size of clamp to secure the carburetor between the airbox and the intake manifold.### (for comparison purposes)