SU Fixed Metering Needle — Code ZD | ZD | SU Specialists

Genuine SU fixed metering needle, code ZD, for SU carburettors with a .100in jet.

• Needle code: ZD
• Type: Fixed
• Jet size: .100in
• Profile stations: 15

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.

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