Gas needle W-08 Dellorto PHBG

What is the Dell'Orto PHBG throttle needle?

The Dell'Orto PHBG throttle needle is a long, thin metal part that is located in the venturi, a narrowing in the carburetor where air is mixed with fuel. This needle is attached to the throttle valve and usually has a conical shape. The position of the needle relative to the jet determines the amount of fuel that is supplied to the engine at different throttle valve positions.