20/15 SI carburetor for the Vespa 125 (VNB) and Super 150 (VBC1), 125cc and 150cc scooters This is an aftermarket replacement Vespa carburetor from Spaco. Description 20/15 SI carburetor for the Vespa 125 (VNB) and Super 150 (VBC1), 125cc and 150cc scooters. This is an aftermarket replacement Vespa carburetor from Spaco. Specifications Engine Size(s): 125 cc; 150 cc Engine Intake Inner Diameter: 20 mm Air Intake Inner Diameter: 23 mm Overall Depth: 8 cm Overall Width: 7.4 cm Overall Height: 11.8 cm Center to Center Mounting Hole Distance: 6 cm Mounting Holes Diameter: 10 mm Drain: No Fuel Shutoff: No