The best of all PHBG in Ø21mm, the 21 BS is a good carburettor dell. In male type, it allows you to fit in a soft pipe without sleeve and therefore to have a short carburation that promotes acceleration and recovery.
You can also enter it with a carburettor bond sleeve. These adjustment and repair parts are easily found at low prices. The low consumption, the noise it causes, the power and recovery it offers have made the reputation of the Italian carburetors DELL'ORTO.
Type: male (soft)
bushel: screw cover
Pipe fastening diameter: 25mm
Fixing diameter air filter: threaded d.32mm (possibility of placing a tulip dellorto)
Starter : cable
Separate greasing: no
depression: no
needle: type W16
primary sprinkler: 72 (banal dellorto)
idling nozzle: 50
starter nozzle : 60