21mm

used 2500 miles. mostly stored inside. 2 years. i tried to use it on my scooter, and it was too small for my bike. its got a pull choke. and everything it came with stock. https://www.treatland.tv/dellorto-PHBG-21mm-black-race-carburetor-p/dellorto-phbg-21-ds-race-2699.htm i got the...