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.
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