Needle valve

MG: MGB with SU-HS4 carburettors: Roadster to GHN5-254942, GT to GHD5-256646 (1962-71)

Sprite / Midget: with 948 cc, 1098 cc and 1275 ccm (1958-74) plus Midget 1500 with SU-HS4 carburettors (1974-79)

Austin Healey: BN7 and BT7 with triple SU-HS4 carburettors from engine no. 29E101 (1961-62)

Jaguar: XJ6 with SU-HIF7 carburettors: 4.2 Series II 4.2 from engine no. 8L26204 to 8L79249 (1976-79) plus 3.4 Series II from engine no. 8A5099 (1976-79) and all 3.4 Series III (1979-87)

Mini: with SU-HS2 and SU-HS4 carbuettors (1959-90)

Triumph: Spitfire 1500 with SU-HS4 carburettors (1974-80) • Herald 1200 with twin SU-HS2 carburettors from engine no. GA190341 plus all 12/50 (1965-70)

Reliant: Scimitar GT SE4 and GT SE4a with Ford 2.5 litre inline six cylinder engine (1965-66)

for SU carburettors - bore: 0.070"

Original float needle valves consisted of a plastic body with brass tip and steel needle.
This improved version with Viton sealing cone and a brass valve guide is more reliable. Viton is very resistant to petrol and forms a particularly good seal because it is elastic.
The Viton valve tip is reliably pressed into its seat by a spring-loaded pin.