Type 6 Carburetter 1929-54

Type 6 Carburetter Settings Chart

A standard needle jet is used on the type 6 models unless a size is given. Standard needle jet on the Monobloc is .106. Standard needle jets are not usually marked. The needle position is the number of grooves from the top. Mixing chamber tops can have one, two or no threaded holes for cable adjusters; there is an adjuster on the carburetter OR in the cable, not both, see main listing for details.

In addition to the variation of carburetters listed above there is a profusion of float chambers. The arm that attaches the float chamber to the mixing chamber can be one of several angles in order to keep the float vertical and can be angled to the left or right dependant on which side it is attached. Also the fuel can be admitted at the top or the bottom and using alternative fittings; these are listed below in the column headed “Fuel pipe fitting”.

Top = top feed – Bott = Bottom feed
Direct = Fuel pipe is attached directly to a threaded brass fitting that is part of the chamber
Banjo = Fuel pipe is attached to a banjo that is bolted to a threaded brass fitting with a side hole in it.

It has to be admitted that some of this information is a bit hazy as Ariel did not always list Amal parts and when they did they were not that accurate about it. Generally Amal’s listings are more accurate but they are a bit inaccurate about the model listings, for instance they list a 498cc KH Red Hunter 1950-54 as having a different specification of carburetter to a 500cc Twin, RH (KH) 1953-54!

Model Years Carburetter Type Bore Main Jet Slide Needle Position Needle Jet Float Angle Fuel Pipe Fitting Mixing Chamber Top
LF/LG 1934-36 74 25/32 85 3 3 .106 15 Top banjo 4/032
LH 1933-36 75 7/8 110 3 3 .107 15 Top banjo 4/032
LF/LG/LH 1937-38 75 7/8 110 3 3 .107 15 Top banjo 4/032
NF/NG 1933-38 75 7/8 110 4 3 .106 15 Top banjo 4/032
NG-W/NG 1939-41 275 7/8 120 4 3 .106 15 Top banjo 4/032
NG-W/NG 1942-50 275 7/8 120 4 3 .106 15 Bott direct 4/032
NH 1933-38 76 1 150 4 3 .106 15 Top banjo 6/032
NH 1939-40 276 1 150 4 3 .107 15 Top banjo 6/032
NH 1946-54 276 1 150 4 3 .107 15 Bott direct 6/032
VG (14/089 float) 1932 76/024 1 3/16 150/160 5 12 Top direct
VF, VG 1933 76 1 1/16 170 5 3 .106 15 Top banjo
VF, VG 1934-38 76 1 1/16 170 4 3 .106 15 Top banjo
VG 1939-40 276 1 1/16 170 4 3 .106 15 Top banjo 6/403
VG 1946-50 276 1 1/16 170 4 3 .106 15 Bott direct 6/032
VH 1933-38 89 1 1/8 200 3 3 .106 15 Top banjo 29/300
VH 1939-54 289 1 1/8 200 3 3 .106 15 Bott banjo 29/300
HS 1954 10TT9 1 3/16 380 6 4 .109 15
HS MK I 1955-58 10TT9 1 3/16 400 6 3 .109 15
VB 1933 6 1 150 5 2 .106 15 Top banjo 6/032
VB 1934-39 76 1 160 4 3 .106 15 Top banjo 6/032
VA 1939-40 76 1 140 4 3 .106 15 Top banjo 6/032
VB 1946-54 276 1 160 4 3 .106 15 Bott direct 6/032
KG 1948-52 276 15/16 140 3 3 .107 0 Bott direct 6/031
KH 1948-54 276 1 150 3 3 .107 0 Bott direct 6/031
FH 1954 276 1 1/16 160 4 2 .106 7 Bott banjo 6/403
4F 1931-32 74 21/32″ 95 4 0 Bott direct
4F, sidecar 1931-32 74 21/32″ 110 4 0 Bott direct
4F 1933-35 74 21/32 90 4 3 .106 0 Bott direct
4F 1936 74 21/32 90 4 2 .106 0 Bott direct
Fleet Van 1931-33 5/150 7/8 110 4 3 ?
Fleet Van 1931-35 75 7/8 110 4 3 ?

Gasket Sets

Part No

Description

Model

Years

GS275

Amal type 6 carburettor 74,75,274,275 1939-54

GS276

Amal type 6 carburettor 76,276 1939-54

GS289

Amal type 6 carburettor 89,289 1939-54

GS375

Amal Monobloc carburettor 375 1954-58

GS376

Amal Monobloc carburettor 376 1954-58

GS389

Amal Monobloc carburettor 389 1954-58

622/208

Amal Concentric Mk1

622/209

Amal Concentric Mk1 1/2

The original Amal carburetters were based on the products of the three companies that made up AMALgamated Carburetters Ltd. Initially they had brass bodies and separate float chambers, and were available in 4 body sizes each of which were available in several bore sizes; these were known as types 4, 5, 6 and 29. They were fitted from 1929 until 1933 wh en the body material was changed to zinc die cast alloy and the model numbers were modified to types 74, 75, 76, and 89. They can be distinguished from the later types because these have four air holes around the base of the body which the next type does not. In 1939 types 274, 275, 276 and 289 were introduced; these have two internal primary air passages in the base of the jet block. A later version with an ‘R’ suffix denotes that the primary air passage hole was moved to the air intake.

 Each type number mentioned above indicates a different size of casting. Each casting was to any one of several bore sizes. Therefore when searching for a replacement carburetter, the bore or choke size is needed in addition to the type. The suffix shown after the type on the flange indicates which jets, float chamber and to which machine it was originally fitted, it is irrelevant providing the body is of the correct size and type and the correct jets etc are used.

Poor starting and erratic tick over is usually caused by wear between the throttle valve and the body. Fitting a new slide in a worn body is like fitting a new chain to old sprockets, a waste of time. Wear is likely to be apparent as early as 5,000 miles, but can be rectified by boring the body oversize and fitting a sleeve to the slide. The materials used in this process will last a lot longer than the original. This is preferable to fitting a non-original later type of concentric carburetter. The new Monobloc carburetters that are now available have improved materials. The prices for re-sleeving are given in the price list by RES169 or RES170 for a complete overhaul.

For jetting application please select your bike make from the following list.

ArielBSA,

Part No.

Description

Carburetter. Type

Models

A7/1057/14

Insulating spacer 7/8 bore x 1/8 thick

A7/1057/17

Insulating spacer 1 1/16 bore x 1/8 thick

4/031

Mixing chamber top ring 74/274/75/275

4/032

Mixing chamber top, 2 adjuster type for non-adjuster cables 74/274/75/275

4/035

Cable adjuster (lock nut is 5/077 and not originally fitted) All

4/037

Throttle slide return spring 74/274/75/275/76/276

4/038

Bellmouth, chrome 74/274/75/275 NG

4/040

Jet block washer 74/274/75/275

4/041

Throttle needle clip ?

4/042

Main jet, All See settings chart

4/043

Float chamber holding bolt All

4/045

Air slide 74/274

4/046

Air slide spring All

4/047

Air slide guide tube 74/274

4/052/3

Throttle slide, No. 3 cutaway 74/274 See settings chart

4/052/4

Throttle slide, No. 4 cutaway 74/274 See settings chart

4/052/5

Throttle slide, No. 5 cutaway 74/274 See settings chart

4/053

Mixing chamber bolt washer (2 per) All

4/060

Split pin to stop cable falling out All

4/061/105

Needle jet, standard .105 Not 89/289 See settings chart

4/061/106

Needle jet, standard .106 Not 89/289 See settings chart

4/061/107

Needle jet, .107 Not 89/289 See settings chart

4/061/108

Needle jet, .108 Not 89/289 See settings chart

4/061/109

Needle jet, .109 Not 89/289 See settings chart

4/062

Union nut 74/274

4/063

Throttle stop screw All

4/065

Taper needle 74/274

4/137A

Blanking plug on top of mixing chamber All

4/148

Air screw spring All

4/230

Needle clip All

4/235

Cap retaining spring clip, for top with adjuster Not 89/289 All except KH

4/241

Cap retaining spring clip screw All

4/263

Throttle spring 274/75/275/276

4/276

Cap retaining spring clip, for top without adjuster Not 89/289 KH

5/038

Bellmouth 75/275

5/045

Air slide (choke) 75/275

5/047

Air slide guide tube 75/275

5/052/3

Throttle slide, No. 3 cutaway 75/275 See settings chart

5/052/3.5

Throttle slide, No. 3 1/2 cutaway 75/275 See settings chart

5/052/4

Throttle slide, No. 4 cutaway 75/275 See settings chart

5/052/5

Throttle slide, No. 5 cutaway 75/275 See settings chart

5/065

Taper needle 75/275 See settings chart

5/077

Cable adjuster lock nut (adjuster is 4/035) Not fitted originally All

6/031

Mixing chamber top ring 76/276

6/032

Mixing chamber top, 2 adjuster type for non-adjuster cables 76/276

6/033

Union nut, shallow 76/276 Not Ariels

6/038

Bellmouth 76/276 NH,VG,VA,KG,KH,VB

6/040

Jet block washer 76/276

6/045

Air slide 76/276

6/047

Air slide guide tube 76/276

6/052/3

Throttle slide No. 3 cutaway 76/276 See settings chart

6/052/35

Throttle slide No. 3 1/2 cutaway 76/276 See settings chart

6/052/4

Throttle slide No. 4 cutaway 76/276 See settings chart

6/052/5

Throttle slide No. 5 cutaway 76/276 See settings chart

6/062

Union nut, deep 76/276 All Ariels

6/065

Taper needle 76/276

6/110

Inlet adapter for air filter hose or offset pancake filters 76/276

6/403

Mixing chamber top, no adjuster type for mid-adjuster cables 76/276

13/129

Pilot air screw All

13/153

Drain screw, float chamber, small about 3/16 diameter All 1933-49

14/012

Float chamber lid, complete, top feed, fuel pipe connects direct to top All

14/014

Float clip All

14/015

Float, bottom feed float chambers, see 14/304 All

14/017

Float and needle, top feed All

14/021

Float chamber lid lock bolt All

14/024

Float needle, all large (1 7/8″) bottom feed float chambers. If there are 2 grooves, 1 should be labelled ‘P’, this should be used with plastic floats. All

14/026

Spigot for petrol pipe, push on pipe, not as illustrated All

14/030

Float needle, all large (1 7/8″) type 2 top feed float chambers except 2DX and 2EX

14/032

Tickler spring All

14/034

Float chamber lid, complete, top feed, fuel pipe connects via a banjo All

14/035

Fuel banjo, single inlet, threaded 1/4 BSP All

14/036

Union nut, holds banjo to base of float chamber All

14/037

Banjo washer All

14/039

Float chamber drain bolt fibre washer, small All

14/042

Gland nut, 1/4 BSP, for petrol taps, threaded banjos, ukuleles All

14/042Q

Gland nut, 1/4 BSP, for petrol taps, threaded banjos, stainless All

14/043

Fuel banjo, double inlet, 90 degree, not threaded All

14/049

Single banjo, solder type All

14/175

Float bowl gland nut washer, bottom feed, not banjo type All

14/208

Float chamber lid complete All Not VA,HS,LH

14/209

Tickler button All

14/210

Tickler bush All

14/289

Tickler split pin All

14/301

Tickler complete All

14/304

Float & needle assembly, bottom feed, replaces 14/015 & 14/024

14/345

Single banjo, push-on type

16/010

Idle screw lock nut for 4/063 All

23/110

Float chamber drain bolt fibre washer, large All 1950-54

29/041

Mixing chamber cap top ring 89/289

29/042

Mixing chamber top, 2 adjuster type for non-adjuster cables 89/289

29/047

Throttle slide spring (see also 4/263) 29/289

29/048

Bellmouth, small (not originally used by Ariel) 89/289

29/050

Jet block washer 89/289

29/055

Air valve (choke slide) 89/289

29/057

Air valve guide tube 89/289

29/062/3

Throttle valve No. 3 cutaway 89/289 See settings chart

29/062/35

Throttle valve No. 3 1/2 cutaway 89/289 See settings chart

29/062/4

Throttle valve No. 4 cutaway 89/289 See settings chart

29/062/5

Throttle valve No. 5 cutaway 89/289 See settings chart

29/075

Needle 89/289

29/076/105

Needle jet, .105 89/289 See settings chart

29/076/106

Needle jet, .106, standard 89/289 See settings chart

29/076/107

Needle jet, .107 89/289 See settings chart

29/077

Banjo bolt, float chamber to mixing chamber 89/289

29/078

Mixing chamber union nut, deep 89/289

29/078A

Mixing chamber union nut, shallow 89/289

29/110

Inlet adapter for air filter hose or offset pancake filters 89/289

29/201

Cap spring for carburetter. top with cable adjuster 89/289

29/201

Cap spring for carburetter. top with rod choke 276 KH

29/300

Mixing chamber top, no adjuster type for mid-adjuster cables 89/289

29/301

Cap spring for carburetter. top without cable adjuster 89/289 VH

30/318

Carburetter top with rod operated air valve 276 KH

64/156B

Float chamber KG/KH

64/186B

Float chamber body, 15 degree, bottom feed

64/353

Float chamber blanking screw, large 1/4″ diameter All 1950-54

229/300

Bellmouth 89/289 VH

S21-4

Spigot for soldering to copper ¼” pipe, as illustrated
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