Twin HS4 Carburettor
Label Part No Description Quantity Comments
1 C-AUD640 Pair of carburettors, swinging needle AAK only 1 Special Tuning
1 FZX3054 Pair of carburettors and manifold kit less air cleaners 1 Not built up
2 AUC8114 Dashpot damper 2 Unique to HS4 twin carbs
3 AUC4900 Dashpot damper seal, when required 2 Special order
4 AUC4587 Dashpot spring blue, 2.5oz 2
4 AUC4387 Dashpot spring red, 4.5oz 2
5 AUD1006 Fixed needle number 7 2
6 AUD9102 Jet assembly R/H (0.09”) longer pipe 1 Black band-special order
6 AUD9098A Jet assembly L/H (0.09”) longer pipe 1 White band-special order
6 AUD9141A Jet assembly L/H (0.09”) alternative set to [LINK]AUD9098[/LINK] 1 Green band-std fitment
6 AUD9142A Jet assembly R/H (0.09”) alternative set to [LINK]AUD9102[/LINK] 1 Pink band-standard fitment
7 WZX1341 Jet bearing assembly fixed needle 2
7 WZX1442 Jet bearing assembly swinging needle 2
8 WZX1177 Spindle 2
9 WZX1323 Butterfly disc with screws 2
9 WZX1325 Butterfly disc with air valve plus screws 2
10 AUC1358 Butterfly screw, was RTC5965 4
11 AUD2129 Nut 2
12 AUD2193 Washer 2
13 AUD2194 Rubber seal 2
14 WZX1300 Float and gasket 2
15 AUC1152 Pin 2
16 CA90 Needle and seat, float valve 2 Upgrade
17 WZX1100A Needle and seat, float valve, Grose jet 2 Alternative
17 AUC8459 Float gasket 2
18 JZX1394 Float and dashpot gasket screw 12
19 AUC1336 Grommet, rubber R/H 30°. Mini 1 With [LINK]AUD9102[/LINK]
19 AUC1316 Grommet, rubber L/H 30°. Mini 1 With [LINK]AUD9098[/LINK]
19 AUD2676 Grommet, rubber R/H 20° angle, MGB and Midget 1 When using [LINK]AUD9142[/LINK]
19 AUD2677 Grommet, rubber L/H 20° angle, MGB and Midget 1 When using [LINK]AUD9141[/LINK]
20 AUC1426 Pivot bolt 2
21 AUC1424 Pivot nut 2 Special order
22 AUC1318 Float chamber bolt seal 2
23 AUE586 Lever assembly R/H 2
24 AUE587 Lever assembly L/H 2
25 AUC1457 Connecting rod 2.2500” 2 Usually 1.372 for twin HS4
26 AUC1501 Lever alternative to [LINK]AUE180[/LINK] 1
27 AUD3080 Spindle repair bush .3125” I/D, ream body to 9.5mm 2
28 AUD3306 Spring for swinging needle 2
29 CUD1009 Swinging needle AAK 2
29 CUD1018 Swinging needle AAU 2
30 AUD4288 Swinging needle guide 2 Special order
31 WZX1859 Twin carburettor service kit, jet needle valve gaskets 1
32 CRK254 Rebuild kit with full spindle/disc repair also 1 Not Waxstat type
33 12G292 Twin carburettor linkage pipe 1