Dell Orto Conical A13 Universal NeedleRef : DELLO00181A / 1128811

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.

• Profile: tapered, for a progressive variation in effective opening according to the slide travel.
• Compatibility: specifically intended for Dell'Orto carburetors of the PHVA and PHBN families.
• Usage: designed for fine adjustments of the mixture on urban machines and scooters equipped with these carburetors.
• Material: robust construction for controlled wear and stable geometry over time.

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.