SU Bias (Spring-Loaded) Metering Needle — Code ADA | ADA | SU Specialists

Genuine SU bias (spring-loaded) metering needle, code ADA, for SU carburettors with a .090in jet.

• Needle code: ADA
• Type: Bias / spring-loaded (use with a spring-loaded needle carrier)
• Jet size: .090in
• Profile stations: 16

Needle profile

Diameter in inches at each station, measured every 1/8in down the needle from the shoulder (station 1). A smaller diameter gives a richer mixture at that point. Stations 1–2 set the idle, 3–6 cover part throttle, cruising and pickup, and 7–9 the top end and full throttle on a 1¼in carburettor.

Not sure which needle you need? Use Find My Kit or send us your carburettor details and we will check it for you.