
This part being universal, it may require adaptations
DELLORTO A13 Tapered Carburetor Needle (manufacturer part number: 1625013 08) — needle for PHVA/PHBN carburetors, designed to influence the opening curve of the slide and the richness of the air/fuel mixture.
The needle plays a central role between the main jet and the slide passage: its taper defines how the flow increases as the opening progresses, influencing the richness during intermediate acceleration phases. It installs in place of the original needle; for optimal adjustment, follow the manufacturer's procedure for the carburetor (position of the tab on the clip, checking the needle play, and controlling the float level).
A simple and specific replacement part, this Dell'Orto A13 needle is an essential adjustment component for those looking to master the carburation on urban engines equipped with PHVA/PHBN without modifying other components.