Gas needle A-20 Dellorto PHVA

What is the Dell'Orto PHVA throttle needle?

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