SU Carburettor Needle Recommendations by Vehicle

SU Carburettor Needle Recommendations

Factory-specified needle profiles for British classic cars, 1933–1957. Each vehicle application lists the rich, standard, and weak needle so you can fine-tune fuel mixture to suit your engine and conditions.

Rich Needle

Delivers more fuel throughout the throttle range. Use if the engine runs lean, hesitates under load, or overheats.

Standard Needle

The factory-specified profile for normal road use and fuel. Start here — only change if symptoms persist after other adjustments.

Weak Needle

Reduces fuel delivery. Use if the engine runs rich, has black smoke, or excessive fuel consumption on standard settings.

How to read needle codes: Codes are stamped on the needle shank. HS-series carburettors use a straight-shanked fixed needle; HIF-series use a spring-loaded bias needle — they are not interchangeable. A dash (—) indicates no alternative needle was specified.
A.C 2 models
Year Model Rich Standard Weak
1933–1939 16 h.p 6-Cyl. — L —
1946–1958 16 h.p 6-Cyl. 1 DW D4
Alvis 17 models
Year Model Rich Standard Weak
1933–1934 12 h.p 4-Cyl. KW KW1 SA
1933–1934 16 h.p 6-Cyl. M1 AC HA
1933–1934 20 h.p 6-Cyl. LS1 81 61
1935 14 h.p 4-Cyl. WO4 KWR KW1
1935 16 h.p 6-Cyl. M1 AC HA
1935 20 h.p 6-Cyl. 81 61 62
1936–1937 14 h.p 4-Cyl. WO4 KWR KW1
1936 16 h.p 6-Cyl. AD AC2 M9
1937 16 h.p 6-Cyl. 1 CE M6
1936–1937 20 h.p 6-Cyl. JM BY 3
1936–1937 25 h.p 6-Cyl. 62 R32 1
1936–1937 31 h.p 6-Cyl. KT RP LB2
1938–1939 14 h.p 4-Cyl. Std. 61 DQ L
1938–1939 14 h.p 4-Cyl. Sport — DT CO
1938–1939 16 h.p 6-Cyl. 1 CE M6
1938–1939 20 h.p 6-Cyl. R3 2 M5
1938–1939 25 h.p 6-Cyl. 62 R32 1
1938–1939 31 h.p 6-Cyl. KT RP LB2
1946–1948 14 h.p 4-Cyl. RLS CT CC
1948–1949 14 h.p 4-Cyl. Sport — BJ —
1948–1949 14 h.p 4-Cyl. (L/H) Export RLS CT CC
1950 14 h.p 4-Cyl. Sport 61 DQ L
1951 3 Litre 6-Cyl. Sport — UA —
1952–1956 3 Litre 6-Cyl. Sport L ES —
Armstrong-Siddeley 3 models
Year Model Rich Standard Weak
1933–1935 30 h.p 6-Cyl. WO2 WO3 C1
1936 20 h.p 6-Cyl. KWR RJ RK
1956–1958 2.5 Litre 4-Cyl. SQ SC TC
Aston-Martin 3 models
Year Model Rich Standard Weak
1951–1958 2.5 Litre 6-Cyl., 1½" Carbs — GB —
1951–1958 2.5 Litre 6-Cyl., 1¾" Carbs — RJ —
1951–1958 2.9 Litre 6-Cyl., 1¾" Carbs — SV —
Austin 10 models
Year Model Rich Standard Weak
1948–1951 A40 Sport M7 EK —
1948–1951 A90 Atlantic FO FT FU
1948–1951 4 Litre 6-Cyl., Single Exhaust DP FO FZ
1948–1951 4 Litre 6-Cyl., Twin Exhaust FT FU FS
1952–1955 A40 Sports M7 EK —
1952–1955 Austin-Healey 100 QA QW AT
1952–1955 Austin-Healey Le Mans OA6 OA7 OA8
1956–1957 Austin-Healey 6-Cyl. 4 AJ M1
1956–1957 A105 6-Cyl. 3 V2 AC
1958 Austin-Healey B.N.6 RD CV SQ
1958 Austin-Healey Sprite EB GG MOW
B.M.C 1 model
Year Model Rich Standard Weak
1958 Princess IV RD CV SQ
Daimler 25 models
Year Model Rich Standard Weak
1933–1935 15 h.p 6-Cyl. P4 4 S4
1933–1935 20 h.p 6-Cyl. P6 P61 5
1936 15 h.p 6-Cyl. BM BL BN
1936 15–17 h.p 6-Cyl. L12 BW S4
1936 20 h.p 6-Cyl. B1 BK BJ
1937 15 h.p 6-Cyl. L12 BW S4
1937 15 h.p Thermo Carb 81 BY 3
1937 20 h.p Bronze Carb S6 S5 4
1937 20 h.p Zinc Carb 61 62 AJ
1937 24 h.p 6-Cyl. WO4 RD KT
1938 17 h.p 6-Cyl. 81 BY 3
1938 20 h.p 6-Cyl. AQ AA L11
1938 24 h.p 6-Cyl. WO4 RD KT
1939 17 h.p 6-Cyl. DR EG 61
1939 20 h.p 6-Cyl. AQ AA L11
1939 24 h.p 6-Cyl. WO4 RD KT
1946–1951 18 h.p 6-Cyl. DR EG 61
1946–1951 27 h.p 6-Cyl. S6 CN 5
1946–1951 36 h.p 8-Cyl. — FB FE
1949–1951 2.5 Litre Sport — CE —
1952–1954 3 Litre 6-Cyl. CN 5 AJ
1952–1954 2.5 Litre Conquest Roadster CN 5 AJ
1955 2.5 Litre Conquest — SW —
1955 3.5 Litre Regency — SQ —
1956–1957 2.5 Litre Conquest Century SD TC TJ
1956–1957 3.5 Litre Regency — SQ —
1956–1957 4.5 Litre DK400 — UB —
1958 3.8 Litre Regency — SQ —
Jaguar 3 models
Year Model Rich Standard Weak
1936–1937 20 h.p 6-Cyl. R6 RO AM
1936–1937 20 h.p Thermo Carb 81 R3 2
1938 14 h.p 4-Cyl. 61 DS 2
MG 15 models
Year Model Rich Standard Weak
1934–1935 8 h.p P & PB 4-Cyl. M5 M6 S
1934–1935 12 h.p N & KN 6-Cyl. 4 3 L
1936–1937 10 h.p 4-Cyl. M1 AC S
1936–1937 18 h.p 6-Cyl. AE D8 WX1
1938 10 h.p 4-Cyl. M1 AC S
1938 12 h.p 4-Cyl. BK CO CP
1938 18 h.p 6-Cyl. CL CH CK
1939 10 h.p 4-Cyl. Single Carb M1 AC S
1939 10 h.p 4-Cyl. Twin Carb EM ES AP
1939 12 h.p 4-Cyl. BK CO CP
1939 2 Litre 6-Cyl. CL CH CK
1939 2.6 Litre 6-Cyl. EG EL AM
1946–1953 1.25 Litre 4-Cyl. Twin Carb EM ES AP
1946–1953 1.25 Litre 4-Cyl. Single Carb DK F1 EF
1946–1953 1.25 Litre Competition — LS1 VS
1946–1953 1.25 Litre Supercharged — RM7 —
1954–1955 1.25 Litre Series TF H1 GJ GL
1954–1955 1.5 Litre Magnette ZA M GM GO
1956–1958 1.5 Litre MGA (open) CC GS 4
1956–1958 1.5 Litre Magnette M GM GO
1956–1958 1.5 Litre Series II Magnette — EQ MS
1956–1958 1.5 Litre MGA Twin Cam RH OA6 OA7
Morris 30+ models
Year Model Rich Standard Weak
1933 8 h.p 4-Cyl. M7 M9 MO
1933 10 h.p 4-Cyl. M7 M9 MO
1933 12 h.p 4-Cyl. M1 M2 S
1933 14 h.p 4-Cyl. M1 M2 S
1933 12 h.p 4-Cyl. Van M5 M6 S
1933 14 h.p 6-Cyl. M5 MA S
1933 16 h.p 6-Cyl. H2 QA QW
1933 18 h.p 6-Cyl. S6 S5 4
1933 25 h.p 6-Cyl. KW OA6 OA7
1934 8 h.p 4-Cyl. M7 M9 MO
1934 10 h.p 4-Cyl. M5 MA M6
1934 10 h.p 6-Cyl. H4 1 M5
1934 10 h.p 6-Cyl. Sport WX AK D6
1934 12 h.p 4-Cyl. 1 A1 M6
1934 12 h.p 4-Cyl. Van M1 M2 S
1934 15 h.p 6-Cyl. 2 AE M6
1934 16 h.p 6-Cyl. H2 QA QW
1934 18 h.p 6-Cyl. S6 S5 4
1934 25 h.p 6-Cyl. KW OA6 OA7
1935 8 h.p 4-Cyl. MA BA M7
1935 10 h.p 4-Cyl. M5 MA M6
1935 10 h.p 6-Cyl. H4 1 M5
1935 10 h.p 6-Cyl. Sport WX AK D6
1935 12 h.p 4-Cyl. M5 AP M6
1935 12 h.p 4-Cyl. Van 4 AJ M1
1935 15 h.p 6-Cyl. R3 AE WX
1935 16 h.p 6-Cyl. H4 2 M5
1935 20 h.p 6-Cyl. S6 AM 4
1936 8 h.p 4-Cyl. Series 1 M6 BD M7
Riley 10 models
Year Model Rich Standard Weak
1933–1934 12 h.p 6-Cyl. Standard R RO AM
1933–1934 12 h.p 6-Cyl. Sport WX CW CX
1933–1934 14 h.p 6-Cyl. Standard RLS RLB MME
1933–1934 14 h.p 6-Cyl. Sport 81 R3 —
1935–1937 1.5 Litre 4-Cyl. Sport RO CC 5
1946–1947 12 h.p 4-Cyl. BY 3 V2
1946–1947 16 h.p 4-Cyl. RO 5 AJ
1948–1956 12 h.p 4-Cyl. BY 3 V2
1948–1956 16 h.p 4-Cyl. CY EE EM
1957–1958 2.6 Litre FR AJ V2
1957–1958 1.5 Litre AR AD HA
Rover 30+ models
Year Model Rich Standard Weak
1933 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1934 10 h.p 4-Cyl. 7 CP4 CQ
1934 12 h.p 4-Cyl. 7 CP4 CQ
1934 14 h.p 6-Cyl. AG CS2 CT
1934 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1934 20 h.p 6-Cyl. 4 3 L
1935 10 h.p 4-Cyl. 81 JM 4
1935 12 h.p 4-Cyl. 81 JM 4
1935 14 h.p 6-Cyl. RLS R6 MME
1935 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1936 10 h.p 4-Cyl. BG AZ BF
1936 12 h.p 4-Cyl. BG AZ BF
1936 14 h.p 6-Cyl. RLS R6 MME
1936 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1937–1938 10 h.p 4-Cyl. S6 CN 5
1937–1938 12 h.p 4-Cyl. S6 CN 5
1937–1938 14 h.p 6-Cyl. RLS R6 MME
1937–1938 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1937–1938 16 h.p 6-Cyl. RO BP BQ
1937–1938 20 h.p 6-Cyl. RO BP BQ
1939 10 h.p 4-Cyl. S6 CN 5
1939 12 h.p 4-Cyl. S6 CN 5
1939 14 h.p 6-Cyl. RO EA 5
1939 14 h.p 6-Cyl. Speed Pilot H4 1 M5
1939 16 h.p 6-Cyl. E1 EC EA
1939 20 h.p 6-Cyl. RO BP BQ
1949–1950 2 Litre 6-Cyl. (75) GE FV CR
1951–1952 2 Litre 6-Cyl. (75) — GE FV
1953 2 Litre 6-Cyl. (75) GE FV CR
1954–1957 Rover 60 4-Cyl. — G1 —
1954 Rover 75 6-Cyl. GE FV CR
1955–1957 Rover 75 6-Cyl. — SS SY
1954–1955 Rover 90 6-Cyl. — SS SY
1956–1957 Rover 90 6-Cyl. — SZ —
1958 Rover 60 4-Cyl. — G1 CS
1958 Rover 75 6-Cyl. — SS SY
1958 Rover 90 6-Cyl. — SZ —
1958 Rover 105 6-Cyl. — TM —
Singer 6 models
Year Model Rich Standard Weak
1934 1.5 Litre 6-Cyl. Triple Carb H4 1 M5
1935 9 h.p 4-Cyl. Twin Carb WZ WX1 AK
1935 11 h.p 4-Cyl. Twin Carb WZ CW CX
1935 1.5 Litre 6-Cyl. Triple Carb H4 1 M5
1946–1958 9 h.p 4-Cyl. S5 AH2 QW
1946–1958 10 h.p 4-Cyl. WX O7 CX
Standard 1 model
Year Model Rich Standard Weak
1957–1958 Vanguard Sportsman SD TC TJ
Triumph 8 models
Year Model Rich Standard Weak
1936–1937 14 h.p 4-Cyl. — CD —
1936–1937 16 h.p 6-Cyl. 81 CB 61
1939 14 h.p 4-Cyl. M5 MA M6
1939 16 h.p 6-Cyl. LS1 VS 62
1939 16 h.p 6-Cyl. Roadster H4 2 M5
1953 2 Litre 4-Cyl. Sports — 7 —
1954–1955 TR2 2 Litre 4-Cyl. Sport GE/R FV CR
1956–1958 TR3 4-Cyl. Sport RH SM Sl
Triumph Motor-Cycle 1 model
Year Model Rich Standard Weak
1952–1958 650 c.c Thunderbird S M9 MO
Wolseley 30+ models
Year Model Rich Standard Weak
1933 12 h.p 6-Cyl. VS H4 V2
1933 12 h.p 6-Cyl. Sport WX WX1 AK
1933 16 h.p 6-Cyl. AQ S6 AM
1934 9 h.p 4-Cyl. H4 W3 MA
1934 12 h.p 6-Cyl. VS H4 V2
1934 12 h.p 6-Cyl. De Luxe AA L11 L12
1934 12 h.p 6-Cyl. Sport 61 62 AJ
1934 16 h.p 6-Cyl. AQ S6 AM
1934 2 Litre 6-Cyl. AQ S6 AM
1935 10 h.p 4-Cyl. 1 AU HA
1935 12 h.p 6-Cyl. AQ S6 AM
1935 14 h.p 6-Cyl. Sport AE WX WX1
1935 14 h.p 6-Cyl. AQ S6 AM
1935 18 h.p 6-Cyl. MME 7 AO
1935 21 h.p 6-Cyl. AQ S6 AM
1936–1937 10 h.p 4-Cyl. RO 5 AJ
1936–1937 12 h.p 4-Cyl. RO 5 AJ
1936–1937 14 h.p 6-Cyl. D7 DM D1
1936–1937 16 h.p 6-Cyl. AE D8 WX1
1936–1937 21 h.p 6-Cyl. S4 AH2 AH
1936–1937 25 h.p 6-Cyl. S4 AH2 AH
1938 12 h.p 4-Cyl. L12 4 S4
1938 14 h.p 6-Cyl. D7 DM D1
1938 16 h.p 6-Cyl. CG CJ HB
1938 18 h.p 6-Cyl. HV3 CG CJ
1938 21 h.p 6-Cyl. S4 AH2 AH
1938 25 h.p 6-Cyl. S4 AH2 AH
1939 10 h.p 4-Cyl. 4 AH2 AD
1939 12 h.p 4-Cyl. L12 4 S4
1939 14 h.p 6-Cyl. M6 EH DA
1939 16 h.p 6-Cyl. CG CJ HB
1939 18 h.p 6-Cyl. HV3 CG CJ
1939 25 h.p 6-Cyl. S4 AH2 AH
1946–1948 8 h.p 4-Cyl. 3 V2 V3
1946–1948 10 h.p 4-Cyl. CD FC DQ
1946–1948 12 h.p 4-Cyl. L12 4 S4
1946–1948 14 h.p 6-Cyl. M6 EH DA
1946–1948 18 h.p 6-Cyl. HV3 CG CJ
1949–1954 Four-Forty-Four VS FJ 1
1949–1954 Four-Fifty 4-Cyl. EE EM 1
1949–1954 Six-Eighty 6-Cyl. CJ HB MO
1955–1956 Four-Forty-Four VS FJ 1
1955–1956 Six-Ninety 3 GR V2
1957–1958 Fifteen-Fifty (High Comp.) AH2 M CF
1957–1958 Fifteen-Fifty (Low Comp.) HA EB CG
1957–1958 Six-Ninety (High Comp.) FJ 1 M5
1957–1958 Six-Ninety (Low Comp.) 3 GR V2
1957–1958 Fifteen Hundred HA EB GG

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