Dellorto SHBC 19/19 E carburettor fitting for Vespa PK 50, PK 50 XL. OEM number for comparison purposes Piaggio and Vespa: 178685 port engine: 23.1mm inside connection air filter side: 62mm main jet: M5 # 73 idle jet: M5 # 45 choke jet: M5 # 60 Floats: 6122.2 / 3.5g carburettor slide: 10569.1