Carburetters - single hs4 (capstat) 1975-92

Carburetter Assemblies
From 1975 up until 1992, with the exceptions of a few models built between 1975 and 1977 and the 1990-91 Cooper, all Minis used the later design of single 1 1/2" HS4 carburetter with a 'Capstat' temperature compensating jet (also known as Waxstat). This carburetter type is detailed in this section; earlier HS4 carburetters with conventional, non-temperature compensating jets, fitted between 1964 and 1977, can be found in the previous section.

Identification of your HS4 is absolutely necessary before ordering parts. It should be a simple matter of looking at the aluminium tag attached to one of the float chamber lid screws; the number stamped on the tag should correspond to one of the carburetter part numbers listed here. Failing that, if the tag is missing, a study of the applications below will help.

Reconditioned and in some instances new carburetters are available; please contact us for details.

848cc Carburetter Assemblies
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
1	FZX1043	CARBURETTER ASSEMBLY, HS4	1	1975-76.
	FZX1142	CARBURETTER ASSEMBLY, HS4	1	1976-84.

998cc Carburetter Assemblies
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	FZX1044	CARBURETTER ASSEMBLY, HS4	1	1975-76.
	FZX1146	CARBURETTER ASSEMBLY, HS4	1	1976-82.
	FZX1415	CARBURETTER ASSEMBLY, HS4	1	1982-91; not catalyst models.
	FZX1416	CARBURETTER ASSEMBLY, HS4	1	1982-91; not catalyst models. Alternative.
	FZX1535	CARBURETTER ASSEMBLY, HS4	1	1989-92; catalyst models.

998cc Carburetter Assemblies, Canada and Sweden
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	FZX1150	CARBURETTER ASSEMBLY, HS4	1	1977-80; Canada.
	FZX1152	CARBURETTER ASSEMBLY, HS4	1	1977-80; Sweden.

1098cc Carburetter Assemblies
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	FZX1045	CARBURETTER ASSEMBLY, HS4	1	1975-76; Europe (not UK).
	FZX1160	CARBURETTER ASSEMBLY, HS4	1	1976-82; Europe (incl. UK).

1275cc Carburetter Assemblies
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	FZX1046	CARBURETTER ASSEMBLY, HS4	1	1975-76.
	FZX1164	CARBURETTER ASSEMBLY, HS4	1	1976-80.

New Replacement Carburetter Assemblies
For some original carburetter types, two new replacement carburetter assemblies have been made available:

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	FZX3013	CARBURETTER ASS'Y, HS4, replacement type	1	Replaces FZX1150, FZX1152, FZX1415, FZX1416, and FZX1535 carburetters.
	FZX3014	CARBURETTER ASS'Y, HS4, replacement type	1	Replaces FZX1043, FZX1044, FZX1045, FZX1046, FZX1142, FZX1146, FZX1160 and FZX1164 carburetters.

Gasket, Service, Rebuild and Sundries Kits
A gasket kit includes manifold gasket, air filter gasket, suction chamber damper washer, float lid gasket and jet union washer and seal.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
2	AUE811	GASKET KIT, HS4 carburetter	1

A service kit includes the gasket kit, plus float chamber needle and seat, jet assembly and clip for the jet pick up link.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
3	CSK65	SERVICE KIT, HS4 carburetter	1

A rebuild kit includes the service kit, plus throttle spindle, throttle spindle bushes, throttle disc and throttle disc screws.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
4	CRK121	REBUILD KIT, HS4 carburetter	1	For FZX1043, FZX1044, FZX1142, FZX1146, FZX1415, FZX1416 and FZX1535 carburetters.
	CRK123	REBUILD KIT, HS4 carburetter	1	For FZX1045, FZX1150, FZX1152 and FZX1160 carburetters.
	CRK129	REBUILD KIT, HS4 carburetter	1	For FZX1046 and FZX1164 carburetters.

A sundries kit includes choke cam pivot bolt and tubes, suction chamber screws, float lid screws and washers, stop screws and springs, jet nut, jet spring and washer, spindle lock tab and float pivot pin.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
5	CSK003	SUNDRIES KIT, HS type carburetter	1

Components
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
6	AUD9988	SUCTION CHAMBER ASSEMBLY	1	For all carburetters except FZX1535.
	LZX1968	SUCTION CHAMBER ASSEMBLY	1	For FZX1535 carburetters.
7	AUD4251	SCREW, locking needle	1	Included in suction chamber assembly.
8	JZX1394	SCREW, chamber to body	3
9	AUC8103	DAMPER, suction chamber	1	For all carburetters except FZX1043 and FZX1142.
	CUD4103	DAMPER, suction chamber	1	For FZX1043 and FZX1142 carburetters.
10	AUC4900	WASHER, fibre, damper	1
11	AUC4387	SPRING, piston, red	1	For all carburetters except FZX1535.
	AUD4355	SPRING, piston, red	1	For FZX1535 carburetters.
12	WZX1120	PISTON GUIDE KEY KIT	1
13	AUC2054	KEY, piston guide	1	Included in piston guide key kit.
14	AUC2099	SCREW, piston guide key	1	Included in piston guide key kit.
15	AUC1249	PIN, piston lift	1	If fitted.
16	AUC1151	SPRING, piston lift pin	1
17	AUD4150	CIRCLIP, piston lift pin	1
18	CUD1002	NEEDLE, jet, biased (AAC)	1	For FZX1415, FZX1416 and FZX1535 carburetters.
	CUD1025	NEEDLE, jet, biased (ABB)	1	For FZX1046 and FZX1164 carburetters.
	CUD1037	NEEDLE, jet, biased (ABP)	1	For FZX1045 and FZX1160 carburetters.
	NZX4004	NEEDLE, jet, biased (ADD)	1	For FZX1150 carburetters.
	NZX4005	NEEDLE, jet, biased (ADE)	1	For FZX1044 and FZX1146 carburetters.
	NZX4006	NEEDLE, jet, biased (ADF)	1	For FZX1152 carburetters.
	NZX4008	NEEDLE, jet, biased (ADH)	1	For FZX1043 and FZX1142 carburetters.
19	WZX1276	NEEDLE GUIDE KIT	1
20	JZX1039	GUIDE, needle	1	Included in needle guide kit.
21	AUD3306	SPRING, needle	1	Included in needle guide kit.
22	LZX1111	JET ASSEMBLY	1	Capstat jet body with blue identification sleeve.
23	AUE1111	JET ASSEMBLY	1	Replacement non-Capstat type jet.
Note that if converting a Capstat carburetter to non-Capstat, along with the replacement jet listed above the pick up lever and link conversion kit BFS701SUR and cam lever spring AUD2432 will also be required.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
24	AUD2129	NUT, jet union	1	Included in jet assembly.
25	AUD2193	WASHER, jet union	1	Included in jet assembly.
26	AUD2194	SEAL, jet union	1	Included in jet assembly.
27	WZX1442	JET BEARING KIT	1
28	JZX1182	BEARING, jet	1	Included in jet bearing kit.
29	AUC2002	NUT, jet locking	1	Included in jet bearing kit.
30	AUC2114	SPRING, jet locking	1	Included in jet bearing kit.
31	JZX1183	NUT, jet adjusting	1	Included in jet bearing kit.
32	AUC1310	FLOAT CHAMBER, RH mounting	1
33	AUD2071	ADAPTOR, float chamber mounting	1	Natural coloured die cast metal.
34	BH504161	BOLT, float chamber attachment	1
35	LWZ304	WASHER, locking	1
36	PWZ104	WASHER, plain	1
37	AUE266	FLOAT CHAMBER LID ASS'Y	1	Includes float, needle and seat and float lid gasket.
38	WZX1300	FLOAT KIT	1	Includes float lid gasket.
39	AUC1152	PIN, float hinge	1
40	WZX1100	NEEDLE AND SEAT ASS'Y, float chamber	1	Includes float lid gasket.
41	AUC8459	GASKET, float lid	1
42	AUC1215	PLATE, baffle	1
43	WZX1287	FLOAT LID SCREW KIT	1
44	JZX1394	SCREW, float lid attachment	3	Included in float lid screw kit.
45	AUC2246	WASHER, locking	3	Included in float lid screw kit.
46	AUC1038	TAG, carburetter identification	1
AUC1038 is a blank tag; when ordering, please state the carburetter assembly number you require stamped on the tag.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
47	WZX1177	THROTTLE SPINDLE KIT	1	Includes lock tab, disc screws, manifold and air filter gaskets.
48	AUD3080	BUSH, throttle spindle	2
Note that the throttle spindle bosses on the carburetter body must be reamed to 9.5mm diameter before fitting bushes.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
49	WZX1324	THROTTLE DISC KIT	1	For FZX1043, FZX1044, FZX1142, FZX1146, FZX1415 and FZX1416 carburetters.
	WZX1322	THROTTLE DISC KIT	1	For FZX1535 carburetters.
	WZX1325	THROTTLE DISC KIT	1	For FZX1045, FZX1150, FZX1152 and FZX1160 carburetters.
A throttle disc kit includes throttle disc, throttle disc screws, manifold and air filter gaskets.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
50	AUC1358	SCREW, throttle disc to spindle	2
51	AUD2787	LEVER, throttle return	1	Not sealed adjustment carburetters.
52	WZX981	THROTTLE STOP SCREW KIT	1	Not sealed adjustment carburetters.
53	AUC8483	SCREW, throttle return lever stop	1	Not sealed adjustment carburetters; included in throttle stop screw kit.
54	AUC2451	SPRING, stop screw	1	Not sealed adjustment carburetters; included in throttle stop screw kit.
55	JZX1179	LEVER, throttle return	1	Sealed adjustment carburetters.
56	AUC8483	SCREW, throttle return lever stop	1	Sealed adjustment carburetters.
57	AUD4771	CLIP, stop screw	1	Sealed adjustment carburetters.
58	AJD8104Z	NUT, throttle spindle	1
59	AUC1206	LOCK TAB, throttle spindle	1
60	WZX981	IDLE ADJUSTING SCREW KIT	1	Not sealed adjustment carburetters.
61	AUC8483	SCREW, idle adjusting	1	Not sealed adjustment carburetters; included in idle screw kit.
62	AUC2451	SPRING, idle adjusting screw	1	Not sealed adjustment carburetters; included in idle screw kit.
63	JZX1180	SCREW, idle adjusting	1	Sealed adjustment carburetters.
64	AUD3586	O RING, idle adjusting screw	1	Sealed adjustment carburetters.
65	AUD2859	CHOKE CAM LEVER	1
66	WZX1339	CHOKE RETURN SPRING KIT	1
67	AUD4867	SPRING, cam lever	1	Included in choke return spring kit.
68	AUD2432	SPRING, cam lever	1	Required if converting from Capstat jet to non-Capstat jet.
69	AUC1375	SPRING, pick up lever	1	Included in choke return spring kit.
70	AUD2429	WASHER, choke cam lever	1
71	AUC8400	BOLT, pivot	1
72	AUC8473	TUBE, pivot bolt, inner	1
73	AUD2430	TUBE, pivot bolt, outer	1
74	AUD2433	WASHER, distance	1
75	AUD4870	LEVER, pick up	1
76	WZX1354	LINK KIT, pick up	1
77	AUD4877	LINK, pick up	1	Included in pick up link kit.
78	JZX1259	CLIP, link	1	Included in pick up link kit.
79	BFS701SUR	LEVER AND LINK KIT, pick up	1	Required if converting from Capstat jet to non-Capstat jet.
80	12G2125	GASKET, air filter	1
81	AUD2219	GASKET, manifold and insulator	3
82	FNZ206	NUT, carburetter to manifold	2
83	PWZ106	WASHER, plain	2

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Carburetters - single hs4 (capstat) 1975-92

BOLT- 1/4 UNC x 2'' FLOAT CHAMBER TO CARB-HS4

THROTTLE STOP & IDLE SCREW KIT-HS CARBURETTERS

JET BEARING-KIT-HS2;4;6 CARBS

LINK KIT-JET PICK UP-HS4 WAXSTAT CARBURETTERS

CHOKE RETURN SPRING KIT-HS4 WAXSTAT CARBS

THROTTLE DISC KIT-HS4 CARBS.

THROTTLE DISC KIT-HS4 CARBURETTERS

THROTTLE DISC KIT-HS4 WAXSTAT-SUITS FZX1535 CARBS.

FLOAT KIT - ALL HS CARBURETTERS

FLOAT LID SCREW KIT-HS CARBURETTERS

NEEDLE GUIDE KIT-BIASED NEEDLE-HS & HIF CARBURETTERS

THROTTLE SPINDLE KIT-HS4 CARBURETTERS

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