Vespa PX150EFL (VLX1T 711688 - 6000000) 1987 - 1998 Dellorto SI20/20D Carburettor and Airbox
Sometime during the 1990's the carburettor fitted was changed from a Dellorto SI20/20D made in Italy to a Dellorto SI20/20D made under license by Spaco Carburettors in India. Although most parts are interchangeable the fuel mixture screw is not. Care must be taken to select the correct one.
For different sizes of SI carburettors and jets see Performance SI Carburettor