Dellorto SHB 16 / 10F carburettor suitable for Vespa PK 50 S. OEM number for comparison (Piaggio and Vespa): 245425 connection engine: 19.5mm connection Air filter side: 62mm choke jet: M5 # 050 main jet: M5 # 053 Pilot jet: M5 # 038 floats : 6122.2 / 3.5g float type: SHA, SHB, SHBC carburettor slide: 6231.8