Gasnaald A-07 Dellorto PHVA

What is the Dell'Orto PHVA throttle needle?

The Dell'Orto PHVA 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 and usually has a conical shape. The position of the needle in relation to the jet determines the amount of fuel supplied to the engine at various throttle positions.